I though exactlty the same disco that cooler EGTs would somehow solve the isssue of haivng too much exhaust gas there in the first place..I was going to run my little turbo on e85, but as Scott said, trying to push that much gas through the rear end, although somewhat effective, is also self defeating and probably harmful to your system in general.
In my case I thinks it would be better to simply swap out the turbo and be able to make the same power on PULP, you may gain a little lag but the power would be more effective and better for your engine as a whole. Plus PULP is everywhere