@Warwick89, I'm far from being an expert in this area, but I suggest your high egts are due to low boost.

Have you mentioned what you've had done? I can see you have 3 gauges, did you get a dawse and needle valve installed?? If yes, I'd suggest your dawse valve needs to be screwed in a bit if your gauge contstantly shows only 4-6 psi, that's crazilly way too low. Try by screwing it in 1 turn and see how much more boost you get, if not, try 2 and see etc etc etc. Just beware that boost increases exponentionally so it'll be low, then all of a sudden way high.

Also, try starting your own 'help' thread, it may attract a few more eyeballs.

Good luck.