Brother, you wont need to upgrade the DI injector until you reach 1000hp.

Ive run 27psi(with ALOT more turbo than most) and only gone up to 48% duty cycle. The DI has such a narrow injection window that they had to be huge to get the fuel in. WHen runnign in PE mode, the DI injects when the intake valves are open just like port, only downstream.
Maybe when we get our hands on the new sequencer, DI could be possible since it has true sequntial thruout the rev range. I understand that since the new unit will communicate thru CAN, that we lose a little resolution which could be an issue with DI. they have a minimum PW resolution of like 0.5mS. Could be an issue.