The first pack of FP100c that input in my 360 was totally wasted. It was too tight, tabs ripped, and I ended up pulling three or four frames out at the same time.
I've broken the springs and taken them out to make room for the pack.
Does the timer need to come out as well? I don't want to waste another $15 pack if film.
Have you checked to see that the rollers are turning freely? I had that problem with a 360. They're tight, but after I cleaned the rollers I had no problem on the next pack.
They're rolling fine, I cleaned them before I ever put film in it. It's just pressure on the film pack. The dark slide rips and so do the tabs. Removing the springs alleviated it somewhat but not enough.
What I do on my 360 is after taking first shot, I unlatch film door just so it pops slightly and while holding so it doesn't open up any more, I pull the first tab. "Tab on the "Image sandwich" will now exit thru rollers. Pull out, then latch door. This works for me. Second shot usually comes out normally, but a couple times had to do this on second shot as well.