Ok i'm pretty convinced that the leaks are from the way the holder sits in the camera. I just developed another negative from a different holder and it has the same patter if light leaks at the top of the image. While it could be the bellows, i doubt it b/c they are brand new, and they seem to be correctly attached to the back end of the camera. Next time I use them I'm just going to keep the darkcloth covered over the back end when I take out the darkslide. Hopefully this will solve my problems.