so my questions is how big of a difference is there between a 2.8 and a 2.5 gain screen with our little(or not so little) projectors. also would it be more beneficial to go with a lower gain/ higher viewing angle since our pj's have such a short throw?

i have one of my walls painted flat white right now so any thing should be an improvment.

my pj room is light controled, and im making a cart so i can move the pj anywhere in the room and adjust the height.