Overprinting on vj1304

Hi Guy's,
what is the process for overprinting on translucent vinyl (GF224) Using Flexi Photo print 6 and Mutoh vj1304..?Something to do with origin menu?..can't find an overprint option in photoprint..?
I can get pretty close just by using ref mark taped to platen, print, then re align media.. but would like to know the proper way ..
Thx...oh and I'm battling with the vertical banding when printing Cyan ,mostely in the middle of the platen, it's better 10 inches in from the ends..?..tried multiple heat settings, different profiles, effects..etc etc.....? ideas?.. thx
Erl

 

Thx bud,
Is there a way to get the vj to go back to original origin (like you can do with a plotter)..manual is a bit vague in translation on some areas..!