No one on these forums is throwing rods, so I don't think the issue is "how much boost". It appears we can max out the turbos before breaking hard parts.
Regardless, you're in the space where the Internet can't help you. Pick a qualified tuner, give them a blank check, and hope for the best. Burger can probably do some more for you, so same thing - send him some cash and see what happens.
It helps if you have a specific goal. "Moar!" is not a particularly useful goal.
Worth mentioning that bms is working on a stinger project where they are testing the limits of the platform and seeing what will break first. They just uploaded a quick video that they are throwing bolt ons on the car with jb4 and cpi with bef to see what it makes. Videos should be out this week most likely. I think that will give you a pretty good idea once the video is released.