Lean code on banks 1 & 2.

I have a problem, I have the K&N FIPK, Granatelli, 80mm, cold air programmed, MAF, Weiand/Lingafelter intake manifold, BBK 80mm throttle body, Edlebrock headers and cat-back. I also have the Diablo Predator performance tune. I have upped the WOT fuel to 3% and I don’t want to do anymore in case I blow something up, but I am still getting a lean code from both banks. What should be my next step? I am going to take it to a dyno here in the area but we don’t have anyone near here that can do a good tune on an LS1... Any suggestions?

Trust Wideband O2 readings only. I believe it should be around 12.9-13.2.