For the 4 years that I put up with my severe ulcerative colitis I never had leakage; since the first of my three surgeries for my J pouch, I've had constant leakage, not a lot but enough to constantly irritate things and cause me to either stuff a pad up my butt or wear a pad in my underwear. So what exactly has changed anatomically speaking? My surgeon was quite pleased with the strength of my sphincter muscles prior to surgery; I worked hard to keep them strong for 59 years 
. Just because I didn't use them for five months while I had my bag all that went down the drain? What gives?
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Dietry fibre can cause leakage, basically it makes the gut work harder, and a stressed pouch is more likely to leak. Also gas can apply pressure and cause leakage. So basically, maybe you diet has changed rather than your bod
My husband just wears one at night, that is the only time he has some leakage. I think that is because he likes to snack late at night. :-\
Usually I only have leakage when the pouch needs to be emptied and I can't get to a toilet quickly enough. I used to have night time leakage but that has stopped. I also take 2 Immodium in the evening before bed. So, I tend to wear light pads during the day if I am going to be away from home for a while. It is an annoyance, that's for sure.
Leakage while you had a loop ileostomy isn't really related to leakage from a functioning J-pouch. Leakage is the most common complaint about J-pouches. You might have pouchitis, though, and 10-14 days of an antibiotic might fix you right up. I've always used psyllium powder twice daily, and that seems to help, too.