Grace,
I'm so sorry you're having to deal with this, but am glad you found a place where you can talk with other ostomates about
these issues. Welcome! We talk toilet 24/7!
I had my ileostomy for 8 months before having my rectum removed, and I would pass liquid mucus, but never a mucus ball. That does sound painful.
I hope you find some answers that will bring you relief.
Take care,
Cecilia
P.S. - My sister is going to Scotland this summer to celebrate her 40th birthday. She is so excited!