I have some experience running campaigns, but never did so with mobile.
So I decided to start in Appetiser.
I am promoting a offer that pays 0.52 per conversion.
Here are my stats for 10 hours running it:

First I though I'd get more volume for Brasil. I did 1.5 payout Smart bid, as you refer.
Second, I spent 20 to make 1.56 back.
In adult I'd consider it a bad result, but I have no idea of what experienced mobile guys would say about this campaign.
Any feedback or advice here?
The CTR is a bit low for Brazil, I'm assuming you're getting a lot of traffic from one placement?
And the smart CPA should be around 1.5x, so if payout is $0.52, try making it $0.78
I'm monitoring placements, no one in bringing bad traffic.
I'm still waiting for the campaigns to reach $15 to start cutting things.
Yes, my Smart bid was 0.78.
I would also suggest moving the winning targets to a new campaign and bidding flat CPM instead of smartCPM.
Just a heads up everyone. We've released two new features that you'll want to check out: http://decisive.is/blog/tools-simpler-mobile-ads/