Hi Joni,
As I recall prior to colectomy, several times when my GI removed large lesions from my rectum, he used clips. My body did not like those clips and I had several post colonoscope days filled with cramps and frequency. Not the same as your pouchoscopy experience, but I assume nonetheless, the body does not like foreign objects in it.
And, after my recent pouchoscopy, I remember it took a number of days for loose stools, diarrhea and cramps to subside.