This got me thinking (yes, dangerous!) -- how much unexposed film is left at the end of your frames? Depending on the loading procedure, maybe you could advance past the "Start" line an inch or so more than normal when loading to get a little more buildup on the take-up spool. My Ercona II uses the red window, so I've not personally experienced this problem, but I'd say there is almost two inches of blank film at the end of my rolls (Acros & 400TX).