where is your uc located?
what you are describing, the leakage, was one of my last symptoms to go away from my last flare. I used to have it all day, though (had to wear a maxipad daily, fun times).
I think what finally made it go away was an increase from 2 lialda to 3, daily rowasa, and a change in diet (no dairy, no coffee, no black tea)
are you allergic to mesalamine? I hope you find a med that works for you