I'm a bit new to developing my own film and have a couple of questions. I've made sure the temps and timing were correct, but my negatives seem to have a bit to much curl to them. Once they are cut and put in covers I can put something heavy on them and they will flatten out a bit. I don't have a glass negative holder for my enlarger for 6X6 and need them to be as flat as possible. Any suggestions? Thanks in advance.