WOT going very rich

Hello, I am very new to this process. I have an existing tune that worked well and I just added headers. This is a '17 ZL1 and I was able to do part throttle tuning and the car drives nice. I have the table for AFR Err but no data. I do get data in the EQ Err but my "Tuning Schools" manual is suggesting that I need AFR Err.

At 4000 RPM the AFR command goes to 8.7 commanded. No idea why. I even uploaded my original tune that ran fine before installing the headers. Any help would be appreciated

That's because current commanded EQ of 1.0 = 11.56 AFR. You're probably somewhere along a calculated FlexFuel value to be getting 11.56 instead of ~14.7.

EQ commanded during PE is 0.756. If straight gas that would be 11.11 AFR.