Did you have intolerable side effects with the Imodium? If not, it is one of the best slowing agents for the gut, and safe for long term use. It can be a godsend during those early months while the pouch adapts. You can add soluble fiber and adjust your diet to thicken the stool, but none of that actually slows the gut. That takes time and/or bowel slowing drugs.
If Imodium works for you, consider yourself lucky because it does not work for all.
Jan