I've been experimenting with this very thing. I've found it's best to cut it really close with just a tiny gap (kinda hard to be this precise without making a few templates). I use the pre made templates to see which size I'm closest to, then I draw that on the wafer but when I cut, I adjust it and make it more oval. I keep the plastic from the last pouch to compare with my new cut.
DX 2/10 UP. DX 07/10 UC. Pancolitis. tried: Canasa, Asacol, Bentyl, Imodium, Imuran, Prednisone, Flagyl, Cipro, Remicade, Codeine, Tramadol, Xanax, Morphine, Vicodin, Prozac, ~ nothing worked. 1st surgery 6/8/11! 2 more to go!