1405 lean at WOT

Hey all. New here, and pulling my hair out over this carb.

Some specs:
318, with an eddy 1405
live at 4200', so it should be jetted at least 4% lean.
FPR set to 4psi.

I've had this carb for about a decade since I last rebuilt it. It was running alright, but I wanted to lean it out a bit at cruise. I have an LM-1 wideband to tune with.

I changed a few things, and got it leaner at cruise. But at WOT, it was too lean (mid 13s), and didn't seem to pull like it should. I forgot what jets I had installed, so I opened it up, and the secondaries are .101"s. aka, 8% richer than baseline. It should have been really rich given my altitude. I had planned to go one step bigger, but they were already huge :eek:

To know exactly where I was, I went back to #22 on the 1405 chart, with the secondaries at baseline (0.095"), and it was rich at cruise and power (mid 12s), and 13.5-14 at wot :wtf:

Opened it up again tonight, and the bolts holding the secondary venturies weren't super tight. Cleaned everything, checked the floats, went to #24 on the chart, put it back together, and now WOT is even leaner, around 15. Cruise/power went a tiny bit leaner, but not much.

Any ideas why I'm so lean at wide open throttle?

:thankyou:
https://edelbrock-instructions-v1.s3.amazonaws.com/edelbrock/carb-tuning-guide.pdf