what's with the oversized injectors on this build? You have about 200 cc too much for this set up. Are you certain your a/f is where you say and are not dumping too much fuel. Backing off those fire hoses in tuning seems to be a lot of hassel when what you really need are some 270 or 310 cc. It's the one oddball item in your set up and if your leakdown comes out OK, I would be looking there.