Speaking from experience of 25 years now with a J Pouch, the actual number of BMs is not as important as whether you are fully emptying the pouch each time you go. Extra BMs could be due to not emptying as fully as you should be. My surgeon taught me some maneuvers/exercises which promote full evacuation. In my case, when I am sitting on the commode I stretch and bend my torso to the left and twist upwards in a corkscrewing motion. This maneuver itself usually leads to me completing the evacuation of more fecal material, because it is causing a squeeze on the pouch. My surgeon also told me to stand up after the initial burst of evacuation, bend forward, put arm over abdomen and push, and then sit back on commode. I experimented with these and other maneuvers and if I don't do them I will have extra, unnecessary BMs. You should experiment with what works best for you.
It's basically using the laws of physics and gravity and you do not need to be Albert Einstein to figure out how to use them.