F4 is richer than F8 or 9. F1 is rich, F9 is very lean. I tried this on my setup and a wideband lambda on a dyno logged the AFR in the high 12's - far too lean!
There is no right or wrong answer though, the car needs to be datalogged. You could probably drop the fuelling to 7 or 8 if you're only on T5 with V-power.
Once you go Stage 2, again the car needs logging with VCDS to set it up nicely as there is no right or wrong answer.
Mine is currently running B9, T7, Fuel is either 6 or 7 (really can't remember) but i'm Revo 2+ and have WMI too so not really comparable.