A lot of people are running around 9:1 compressionwith FI these days, sometimes higher, but if you already have the 8:1's in there, then I would just run those and focus on tuning. You could run 14-15lbs of boost on those internals, but it had better be tuned VERY well. I agree that the rods are probably going to be the weakest link, and it would have been better if forged rods were put in the same time the pistons were, but they should hold if your tuning is up to snuff. I probably wouldn't run 15lbs of boost daily on them, but that's up to you. Whatever you decide to do, your main focus should be on proper tuning.