And you shouldn't, its ridiculous u have to deal with these issues, kit shouldn't have been released in this state.
Stock JPC 3" DP, Magnaflow resonators and quad tips netted me 900rwhp on 14lbs with a 76/75 BB unit.
Bigger is always better but not always needed in every situation.
What kind of valve springs to get to 900rwhp. Jpc uses a 3 inch up pipe. Edp uses a 2.5 up pipe and I think the crossover is to small. I did 790rwhp 826rwhp through an auto with a edp kit but that was the limit with trick flow stage 1. It is the bp issues that cause valve float.