Im sorry Ash, I've tried to stay out of this thread.
Your compression is wwwwwaaaaaayyyyyy f**ked.
Your motor has most likely sucked 1 of the 3 turbo's you have gone through.
You say you have it all figured out? I dont think you do. You need to go and buy another motor from the wreckers, this time you need to
Make sure you have a good fuel pump
Make sure you have working turbo's
Make sure you compression test the motor prior to dropping it in
Go and get a tune (for the love of god)
Don't come on here and ask for advice then turn around and say NO I have it all worked out. (very frustrating when you offer advice and it gets thrown in your face!)