It’s true that a well functioning pouch and sphincter can hold watery stool, though not as easily as firmer stuff. Watery stool generally is associated with greater frequency, though. The solid matter still has to be eliminated, and the lost water has to be replaced.
Your pouch is still relatively young - it needs stretching/acclimating to reach its optimal performance. Delaying bathroom trips was an effective strategy for me, but it can be challenging and occasionally messy.
Are you having leakage of small amounts, or full-blown unintended bowel movements? The word “incontinence” suggests the latter to me.