TE Marie, my problem now as well. I had been able to go 3-4-5 days between changes with stoma #1, but not now. Now, it's 2 days, and that's probably pushing it. The watery output indeed wreaks havoc with the seal/ring. It's a bummer, because I'm also relearning how to work with the new stoma and finding the right gear for it.
I've only been on imodium for a day, but what a difference, already. I went from 2210 ml output on Sunday, to 1325 yesterday, and expect even less today. I think I can keep up with that by drinking enough liquids/electrolytes.