What do you mean by 'stock timing' ?
Timing should come up to the 5-8 area when boost builds and then climb to the mid-high-ish teens at redline. AFR should be in the mid 11's everywhere under boost. Also, you're on e85 and you have a freaking hta82 wheel on that thing, turn the boost UP!
Do a boost leak test, sort out little issues as you have been but don't beat on it much until you invest in an a tune with an experienced pro...we have several locally!
This turbo should make 575whp on that dyno without changing too much, so you have a lot too gain
