Deep staging will only help you if you can't react fast enough to the tree to get a good light.
I used to race a 7.00 index class that used a 0.500 pro tree (flashes all 3 ambers at once then green). Since I foot break, I had to bump into the beams pretty deep to get a good light....however, they would not honor deep staging, so it was up to the racer to get the car in deep quickly if you wanted to do it, but the race official would not wait for you. If I got it in fully deep staged (when the prestage bulbs turn off) I would cut really good lights most of the time...then I just drove the stripe to take the win. Had a lot of success with it.
My friend that ran the same class with a T-brake didn't want to be in deep or he would read light...so it really depends on your setup.
