nitrous and gear question?

I am running an 80 shot with a 5115 nos (dry) kit. I have 3.55 gears. I am trapping 111.5mph (12.80). I want to bump the nitrous up to 125 shot, so I will probably gain 2-3 mph on my trap. First will I run out of gear with 4.10? Second when you go with the stage 2 5115 kit there is a washer that goes somewhere? The only place I can think that it might go is on one of the silenoids.

thanks Dan