Please do explain to me why everyone doesn't use booster fans if they can provide the sort of impossible performance you are claiming? You are telling people who read this that it's a good idea to use booster fans instead of a proper inline fans. That's just bad advice.
its just math dude. cubic feet of tent vs cfm. doesnt matter what type of fan it is. air doesnt discriminate between fan types. perhaps your tent has a small passive intake? there is many different designs out there. that could prevent your tent temps from being cooler.
what im saying is booster fans are fine for small tents/boxes because of they're small spaces. use a booster fan in a 4x4 and you're asking for problems.
you're welcome to spend $60+ on big 450 cfm inlines, plus $50 for a variac to dial them down in a 2x2/2x3. Or get a $25 250cfm booster fan, with a more appropriate cfm for the tent size, and a $20 speed controller.
you dont have to change your fans dude, but you can stop calling me a liar because you dont understand now. thanks in advance.