You can try getting the LTFT within +/- 3 of 0% by doing a MAF tune.

I would get a fuel pump rewire and set up your injector table so that all are the same and then see what its saying.

Then you can take away fuel via the MAF.

11.4-11.5 AFR is about perfect for a supercharged car. Read up on tuning info on this site. I can say I've never really followed Gary's tuning ways.