I have only used sharecash and adscendmedia. It's obvious I never went back to shitcash lol.
To optimize my content locker, I drove traffic to it for a few days to see which offers are getting really good conversions and then I add them to the list. Of course, I also excluded the ones that are getting bad conversions.
You should also test whether you get better mobile conversions if you combine mobile+offers, or just having a separate tab. It seems that Canadians convert the best for mobile.. I have no idea why.