Are you insinuating a 2.3 turbo won't take 30psi, no matter how well it's built and tuned? How the hell did I run 20lbs on a stock tune, stock turbo and stock longblock then?
EDIT - They run 15lbs stock with no intercooler, and I've seen many on stock shortblocks running 25-30 reliably with high miles for a long time. Back when I was more into the 2.3 turbos, I had a guy ask me why his XR4Ti was pegging the boost guage all the way over and sounded like someone was firing a machinegun at his hood when he floored it. He said he even held the throttle for 5 minutes like that trying to figure it out. I figured it out - wastegate was stuck shut. Didn't hurt the motor at all, probably took a few miles off it's usable life, but it ran fine with a new actuator. They're tougher than you think, just head on over to the turbo ford boards and look around.