Try setting the timing to TDC statically. If it still does this, it's not a timing issue. It may well be a bad starter, connection, or battery. On the other hand, it DOES sound like a way over advanced ignition setting. Hmm, let us know what you find.
Motorbill
From Lola to Land Rover, If it's British and has wheels, it's likely I've bloodied me knuckles thereupon