What you are talking about is Q-Factor. Basically it is the distance your feet are apart on the bike (really the distance between the outer surface on the crankarms where the pedals thread in).

When manufacturers went to external bearings they altered the angle of the cranks arms to maintain, or in some cases narrow the Q-Factor. My guess is the difference is less than you think.

Having said that I'm not sure why everyone is convinced that narrower is better. I really don't like super-narrow Q-Factors and I am only comfortable shifting my cleats to the inside essentially widening my Q-Factor. You may be in a similar situation.

Other than BBs and frames are all other factors the same? Were you careful to duplicate the positioning on the BB30 frame or did you make any adjustments?