The CV joints may be the issue Ciaran, although mine isn't low so I hope they'll live. Time will tell, in the meantime I'm just waiting on John measuring up Are your shafts fitted yet?
As far as engine goes, no changes. That'll help the shaft situation too. The power I'm at now is enough for the car on the road. It's at a level I'm happy with, that is reliable and the next steps are just too expensive.
You making progress on yours?