Hey mate - one of my good mates has a twin turbo late model 6 engine. if you want I can pass on his email addy.
A lot of these points he may be able to help with.
One thing is injetcors. Being methanol they need lube more often than not. He needs to pull his on a regular basis and looking at your setup this could be a bit of a headache.
Anyway let me know
JD