I've had problems with scaling in the past where I would increase the budget and my CTRs would drop and my CPCs would rise so drastically that I was pushed out of profitability. I was told that my demo sizes were a problem, but now that I fixed that, I seem to be having similar issues.
My question is, at the same time I am increasing the budget, should I also be lowering the bid to counteract the way the CPC acts every time I increase the budget? I would always leave my bid at what it started as, even if the suggested bid was way lower because I would be afraid of tampering with it.