Thats cool... thanks so much for posting that... any additional info you could provide would be amazing. If its a proven morph, shouldn't it be more "known of" among ball python breeders? You seem to know more about them than I've been able to figure out through countless hours of searching the internet. Do you know if there is a super form? VMS' website claims that there is a Harlequin Side-Stripe, which is the super form... but other than that I can't find any info on Harlequin x Harlequin breeding. I assume since you said incomplete Dominant (and not co-dominant) that there is no known super form?
Has anyone tried breeding different lines together? My friend has a VMS line male and my female I believe to be a different line (probably the Canadian line you're referring to). This is solely based on the colours, the VMS line look a lot darker and are more obvious looking that its probably a morph. Where as my girl looks a lot more like a normal colour-wise, but displays the big bold wide stripe... and the saddles are pretty funky looking, too.
Very interested in any more info at all that you could share.
Cheers