The bad spacing is a result of slipping clutches and and sticky catches, CLA time as you well know. When its working right the spacing is regulated by the cams and gears and would need parts swapped to make it work differently. What you might try is to mask a 6x9 back to 6x7 or a 6x7 to 6x6, etc. then there will be no need to redo the machinery and you will get widely spaced frames.