I think Stus been a bit preoccupied these past few days mate, im sure he will cast his eye over this post in the near future though.

If i recall, you are gunna sue Megasquirt? I *think* if my research from a lil while ago is correct, they are 16ohm, and using MS you can sue them fine *was a long tiem ago*, I believe even with low impedance ones (YB cossie type), you can just use PWM current limit to 75%.