I don't use studio fix. I use other powder foundations and use the Sephora bronzer brush to apply it. I sweep the tiniest amount on press it into my skin and do that all over my face and then without dipping it in again, I buff it really lightly in swirls over my whole face and I'm done. I find it gives good coverage without being cakey and uneven that way. Also if you apply concealer, it won't transfer it because you're not sweeping over it right away.
i always go for a fuller coverage i have uneven skin so i use a really sof kabuki its from too face!! its dome shaped and im trying to get my hands on the 182 from mac and their flat top kabuki forget the number....but im broke lol.... but i beat that face lol using not much product i get good enough coverage!