1990 highly modified 434 corvette tune issue

I am trying to tune a 1990 corvette with a 434 CID with 60 lb injectors and I am having a problem, and am looking for some advice. The car idles and drives fine at light throttle but as soon as I get past 25% throttle at 4 volts on the MAP sensor the car appears to go into some sort of limp mode. The car will stumble set the check engine light for a code 33 and cut the injectors pulse from 4 ms to 2 ms. So far I see nothing in the tune that will cause this, any ideas on what is happening? One other issue is if I go straight to full throttle it does take off but my pulse width gets limited to 6.9 ms and the engine goes lean at high RPM.

it was discovered long ago on thridgen.org that 8D had a fueling quirk like this that only happens on large displacement engines(or maybe it was large displacement and large injector? either way).

http://www.thirdgen.org/forums/diy-p...limit-fix.html