I have an adult mobile banner campaign running from 25th April 2014 and here are screenshot from my tracker (the cost and revenue are actual)
Overall

Last 30 days

Last 7 days

Last 3 days

Currently I am only running one offer which is proven to be far better than other offers.
This campaign is on CPC traffic source and I am continuously adding and removing banners.
You seem to be doing a reasonably good job of optimising already?
Pretty nice stats man haha like Zeno said its all in the green and you've done a good job lol...
Scale Scale Scale... is forever
This may be a silly question, but since it wasn't stated in the post... you're not running all those landers against each other at the same time are you?
We don't run adult, but right now you seem to be getting decent ROI for it (compared to what I hear other people say), and your metrics look good! So I would just focus on 1) constantly working to improve your best 1-3 landers, and 2) getting as much traffic as possible now to these pages.
which country you targeting ?
Most of the lp are optimized version of best lps. I am split testing best 3 - 4 landers at a time. SO not all landers are running against each other.
Thank you for your advice.
Sorry I can not reveal my GEO. But its second tier country.
Interesting little case study.
This looks like a problem I regularly have with a selection of certain placements.
I say problem in the loosest sense because you're in the green and have a pretty solid 30%-ish ROI... But I know that feeling of thinking you can improve on what you're seeing.
Over the past few months I've found myself with pretty similar statistics in terms of LP CTR% and CR% and know that if I could get that LP CTR to the magical 30% whilst maintaining 15-20% CR I'd absolutely rake it in. But of course that's easier said than done and CTRs and CRs don't always sync up nicely.
If you're clickbaiting with your banners then you could try selling the message a bit more instead which would likely increase activity on your LP and hopefully lead to more conversions - but you'd likely have to find a new bid price for the loss in CTR.
You could also try split-testing a completely new style of LP to see if that makes any difference rather than just continually optimising what you've been running.
You've sent the advertiser 600 leads or so. I'd definitely be asking for a quality check and payout increase. That could be an instantaneous bump in profits right there.
Most definitely though you should be scaling this to other placements and sources. What you learn from them you might give you insight on how to improve performance on this one.
Looks like a solid campaign.
In CERTAIN GEOs in adult I noticed that I make a solid ROI by pushing "side" offers other than the actual offer I optimize for. I know it doesn't make sense, but somehow it does.
By going broad and getting 3G + Wi-Fi traffic and then optimizing more granularly.
Let's say: Carrier X to X offer, Carrier Y to Y offer, Wi-Fi to a lander and maybe an App Install (be creative here), determinate handsets to other offers.
Calling out the handset or the carrier can bring better conversions too.
You may also notice that certain resolutions perform better with certain landers as well (above vs. under the fold CTAs).
If all this has already been done, and it's a steady low maintenance baby, just keep building more! 
Hope this helps!
Also, try redirecting back some of the non converting traffic to different sources: PlugRush, JuicyAds, Exoclick will buy them back. Split test to see which one pays you more 
Have you narrowed this down to a single offer that beats the rest?
If so, work on adapting the transition from Lander > Offer Page so that it flows more seamlessly.
This could be matching the colour of your LP to the offer, matching the font, adding a mock top navigation, or even changing something simple like "I Agree" to "Next Step" so that it matches the terminology on the next page.
Think about how you can make the entire funnel as smooth as possible.
damn... loving those greens...
overall... A started pretty well.. and slowly dying... might need new stuff on A...
D is still pretty strong...
If you have the best offer and lander only banners are left.
Make sure you find a "model" that works and refresh banners every couple days following the same winning model.
Also try playing with the bids / more traffic sources and even cloning the campaign multiple times.
Yes, I tried many things to improve LP CTR But it seems to be impossible whatever I try. I could scale it way up if I could get that magical 30% Lp CTR.
It seems to be very hard to get conversion with click baiting type high CTR banners. As this is CPC platform, high CTR low converting traffic means loss to me.
I have already got little paybump, but they are asking for higher volume for next paybump.
I have tried to optimize based on OS & carrier, Like LP A for android, LP B for ios . But it seems to be doing worse when I set rules based on OS or carrier. As it is not obvious, I am unable to figure out why.
Yes, I am only running the best offer now. I have tried to imitate offer page to LP to some extent. But my concern is as I look stats for all time one lp is doing better, and when I look for last 30 days or last 7 days, completely different lp is doing better. I am unable to judge which LP should I continue working on.
What do you do in this situation? Do you make decision based on last 30 days data or overall data or last 7 days data?
There is no perfect way to do this unless you are comfortable getting balls deep in lots of drilled-down data.
Generally, make LP performance decisions based on all the data applicable to a certain campaign and pocket of traffic.
However, if you start a campaign and optimise off placements, devices, carriers, etc., the audience changes and so might your back end lander performance.
In this scenario, you will want to gather data for the optimised traffic and compare it to the overall picture - e.g. look at last 7 days vs last day if you made some large optimisation 24 hours ago.
IMO, you can either a) make new campaigns for your 'optimised campaigns' or b) get good at drilling down into data and analysing how LP performance varies with different variables (e.g. carriers, OS, placements). This is a good skill to have as you can uncover pockets of profitable traffic that may otherwise get lost in the average.