Ebay GT45 + 5.9 Magnum + E85 blow thru

Yeah that's what I figured. The trims sticking dead nuts at an even 50% seemed suspicious.

You can leave the MAX at 50% but add extra fuel so that the working Trim is much, much lower than the Max,,,preferably negative like -10%.

If I were tuning it, id NEVER have the ECU have to ADD fuel at WOT. I always want the Base map too RICH and have the ECU REMOVE fuel to hit the target A/F if anything. It's just bad practice to start out far too Lean.