[Jeff Chambers]

30# injectors are maxed for 350 at the wheels; in fact over-maxed. That's why bumping to 45psi has helped a little. The wet system is hurting you even more, unless you've got it on a dedicated fuel pump. It'll steal fuel that should be making it to the injectors. An inline pump may help the situation a little, but IMHO you've still got some fuel system issues that need to be worked out if you're going for 500 at the wheels on a regular basis.

It has been my experience that the stock fuel lines and rails become a real problem above 400rwhp. There may be plenty of people that make it work, but there are also plenty that don't. Trying to push that much fuel through the dinky lines from the tank to the engine bay is a real problem. Replacing those lines with something capable of moving 255lph of fuel (or more) without huge pressure drops will make the fuel system sooooo much happier.