, I think i am going to pull the turbo's and enlarge the bypass holes, to much boost for pump gas!
I would try going to a 5/8" bypass, not quite sure why you are making so much boost with a 1/2" hole. I don't recall Banks sending out anything larger than 5/8" bypass when I worked there, and you are running the same TCS 7 cam and 990 heads that would have been run and/or suggested at the time. Some of the kits went onto "stock" marine LS6 engines that had forged pistons, 8.8-1 compresson, but his higher performance level engines had Arias 7-1 reverse deflector pistons installed.