Will's kit is sold with the goal of roughly 400 RWHP. Anything more agressive tuning wise could potentially bring AFR's dangerously high. Remember those 440's are just about maxed out duty wise at that level and then you have limit's with the F/IC the kit comes standard with.
I was looking at your dyno chart what kind of boost are you running? and is it holding steady psi all the way to red-line. The power curve looks really flat on the top end. It looks like there should be a lot more power in the setup. Make sure that vtec is coming on as well as the secondary butterfly's in the intake manifold.