So this should be the right order
-Commander:Sixth sense ,Concealmant ,then BIA(brothers in arms) or whatever you want
-Gunner:Cocealmant!, BIA ,whatever you want
-Driver :Concealmant,BIA ,whatever you want
-Loader: Concealmant ,BIA ,whatever you want
So you didn't pick up the best setup for your tank but it doesn't matter just keep the cammo net ,or go for GLD like I said ,the differences are minimal .What do you want ,to sit in a bush without being spotted until enemies get really close (also you cant fire), or to have your aim circle shrink a bit faster .
Also I need to know at what precentage are your skills ?(ex commander' sixth sense skill is at 68% or is 98%)
I suggest you do the followings :
Reset skills for loader and gunner(for credits and not for gold) and take concealmant instead.