I don't know if the JP Rollmaster still has a problem with the crank gear. They fit really tight (some need to be honed). Also you need to check it the center line of the cam sprocket and centerline of the crank sprocket are lined up. Sever people I know had to machine meterial off the rear cof the crank sprocket to get the centerlines in line.
See this video:
My last one fit very nicely. I had one that fit like you describe, though, so I'd mic the crank snout and the ID of the sprocket first. Thanks for the reminder.