Hi lestyrox,
Might be worthwhile trying metamucil/fybogel. Although you are not constipated (fibre works both ways - diarrhoea and constipation), it will help "bind" the stool, so you get complete evacuation and don't have to use more toilet paper because of leakage. May have to take 3 times a day. Although I'm not UTD, I have IBS and have similar issues with my bowel movements. I find Metamucil excellent for this reason. Just a thought. HTH.