Any ideas??
 

Quick run down, got new ddp 50 hp injectors, 3200 gvr spring, Denny t stage 2 fuel pin, intake, ffs turned in 2 1/2 turns in, and pump advanced 1/8 "

So at wot I can't build more than 23 lbs boost and when towing 7k lbs can't build more than 18 lbs boost. And this is a 89 non i/c . Why is this