I had an Super Ikonta 3 with a similar issue. I was told it had to do with the difference in film/paper thickness. I got overlaps if i didn't wind the film far enough before closing tha camera back because then the diameter of the take up spool was to small. When I wound the film far enough befor closing I got the frames together but no big overlap. One tip I got but didn't try was to put some tape on the take up spool thus creating a bigger diameter.