Did some testing of the Revo F (Fuel) settings with stage 2+.
Wide open throttle, 3000rpm onwards.
F9 requests 0.88 lambda, or 12.9 AFR
F8 requests 0.85 lambda, or 12.5 AFR
F7 requests 0.82 lambda, or 12 AFR
F6 requests 0.79 lambda, or 11.5 AFR
Didn't go any richer than that, but can only assume it's low 11s, high 10s the richer you go, which is pointless with DI and chucks fuel into the exhaust needlessly. I see so many tuned TFSIs belching out tons of black smoke under WOT conditions. It's just not necessary.
You make more power the leaner you can run, but just watch the timing pull.