I think most of F3J competitors are using the very basic braking system. Close to 90 degree flap deflection with zero (or very small) aileron movement (a few mm up or down). This is the KISS approach
Personally I do not have any aileron movement in crow. Years back I used some up aileron since it was popular back then. Then with Aspires I tested a setup Francesco described. Having some xtra camber in wing tips was nice at the time when 2.3 kg C68 Aspire was considered as "normal", but I do not see need for that anymore.
Having ailerons at zero setting all the time seems to be a good compromise. Increasing tip camber along with flap movement can be nice with fast/heavy model or in total calm conditions. However, I feel that in stronger winds it slowed down the approach too much and makes the plane feel too high lift.
Choose the setup philosophy you like. Then get flap -> aileron mix dialed just right. Ultimately your landings are 98% about pilot skill and 2% of luck.