I thought tunercat had a had a constant that let you choose the desired AFR at WOT? I can't seem to find it. I have accel 24 lb/hr injectors and a AFPR. Problem is that the lowest my AFPR will let me go is 48 lb/hr. I seem to be rich at WOT and when dipping into the throttle. I know this is due to the higher pressure. Maybe all I need to do is increase my injector constant to make up for the higher pressure. Other than that at cruise my BLM are damn near 128.

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1985 Z-28, 350 TPI, T-Tops, edelbrock 6085 heads, ZZ4 cam, accel base/runners & 24 lb/hr inj., ported plenum, everything gasket matched, crane AFPR, SLP 1 5/8 headers, single 3" flowmaster catback, 3" Catco cat, modified tranny, 165 ECM & ARAP code, MSD 6AL/wires, edelbrock STB, Spohn SFC, GW "wonderbar"

 

Take out some PE fuel. BTW, what are you using to tell you are too rich?

 

If the lowest you can set your fuel pressure is 48 then something is wrong, and you need to correct that first.

As you incrase pump pressure you reduce it's volume, you your playing with fire at the WOT end of things.

I'd first set the fuel pressure right and see where your BLs are, at idle and cruise.
then maybe juggle the injector size, ot voltage correction. The do a light WOT pass and see where you are (with the timing retarded some). Then work into your tune

 

For WOT you want % change to fuel by rpm