Headphones,
I'm sorry you're having leaks.
I had the exact same problem after surgery, too, and here's what worked for me... instead of cutting the hole for the stoma in the center of the wafer, I took the guide and moved it up and to the left, which shifted it over a few centimenters away from my incision. The wafer stayed on so much better and the leaks stopped. I hope this little trick works for you, too!!