Don't know if this is the cause of your hyper continence, n3qtrtme, but it has been for me. I've been meaning to update on my experiences, appears this is a good time. There is also reference to this issue on another thread.
On Friday I had my second 'RotoRooter' job to remove scar tissue from the area where the neobladder was sutured to the remaining bladder neck. This scar tissue blocked the bladder neck, and I was unable to urinate normally, and had to self-cath. My surgeon asked if I was a fast healer (I am), and said that fast healers produce more scar tissue than slow healers.
After the first bladder neck resection, the doctor had me remove the Foley he had inserted the next day. Within a week, the scar tissue had regrown, blocking the bladder neck again. This time, he's instructed us to leave the Foley in for 10 days, hoping that the catheter will prevent scar tissue from causing the problem to reoccur.
I'll post an update when we find out if this was effective.....