After looking at your data log, it looks like you are running out of fuel past 4500 rpm or you need to have the tune checked. your a/f is in the 14s and that is not good. The a/f should be around 11.3-11.7 during WOT. Your 39lb injectors are real close to max assuming your hp is close to your torque. As some other members suggested try and get a data log. If you own an sct tuner and a laptop your all set. the log software can be downloaded for free from sct's web site.
just a heads up, the dyno graph you were looking at was vsixxer24's. mine is around 11.3 at WOT.