i wouldnt run any more than 5 psi on a rising rate fuel pressure regulator, and that is including a front mount air/air intercooler,
try and run some sort of cold air box aswell, as hot air is a power killer, you want it as cool as possible before the plenum and before the turbo.
the rate that the fuel pressure rises is important to, i cant remember the reccomended rate, is it something like 10:1 turboe320?,
so it raises fuel pressure 10psi for each 1psi rise in boost.

and yea a bigger fuel pump wont be a bad thing, i run a bosch 910 and it fitted in the factory location without too much modification.