Hi Rob,
Well, at least it's running!!!!
Before you go altering the current cam position, would it be possible to get the lift@ TDC figures it's currently timed at for the inlet and exhaust? This would reveal a lot. If the TDC marking is accurate, you'll only need 1 DTi (But it is a lot easier with with 3....and looks more impressive to people observing lol)
-Gavin