I am hoping that by running a DEI titanium heat shield over the turbine, and DEI titanium wrapping the down pipe and running a 3" downpipe with less turbine back pressure, in addition to the meth injection, I can limit the effects of heat soak. With the smaller down pipe and having extra exhaust piping setup under the hood like you do, and if you are already experiencing heat soak, you might want to run an intercooler. Also how many core radiator are you running? And did you check your setup with a wideband or plugs, because if your running too lean or too rich you can run way HOT. Since you have everything tore apart right now, I would also consider wrapping your up pipe and down pipe to help push the heat out the tailpipe.
And your 100% right about turning up the boost.... I suppose that's thats always a project for down the road... 4 core intercooler and 18-20lbs of boost....
