Mesalamine doesn’t really do much for pouchitis, as far as I know. You could make a good argument for leaving well enough alone, or for trying 10-14 days of Cipro or Flagyl. Once you start treating problems that aren’t bothersome it’s hard to stop.
Your dose of Metamucil seems too small to have much of an effect. Have you tried following the directions on the package? I’ve used it twice a day for a very long time, and it helps steady things for me.
Counting bowel movements is what GIs are trained to do, but it’s a crappy (pun intended) way to monitor relatively healthy J-pouches (15 or 20 per day is a sign of trouble, of course). Since I don’t have urgency unless I really push it, essentially all of my bowel movements are choices rather than necessities. If I’m heading out a few times during the day I’ll probably choose to use the toilet each time before going out, to avoid discomfort, public restrooms, lousy toilet paper, etc. This isn’t evidence of a pouch problem, but the count goes way up on those days.