JM is an awesome game, in fact probably the fastest machine i have played, the orbit loops are insanely fast.
Do you reckon the white base is factory Nino? I've had 3 and none of them have been white - also with the extra supports in there (between the sides and the base, i wonder if someone has put a new base in? Or it may be an early or late production run...
Also, since you have the transformer removed, i would put a piece of rubber between the transformer and its mounting plate. This takes out the loud hum that comes from most of the late WPC models with the transformer mounted in the back
