We are on the same page! Now with this new tune I'm seeing 14.7AFR when the car feels like it's pulling way too hard. I don't have a boost sensor yet but can monitor AFR and whether in open or closed loop at the same time with this PLX gauge. It seems like at lower throttle openings but at high engine load the car holds on to closed loop too long.

I think the Split Second Enricher box would work real well for partial throttle/closed loop tuning. I'm almost there, just sorting hardware issues then looking forward to some tuning.