I agree in that everyone is so different it seems one food really can affect one person negatively and be perfectly fine for another.
If there's one thing I'd recommend is try a more paleo approach or atleast gluten free. Asia seems to suffer a lot less GI related diseases than the west and they eat a rice heavy diet so I've incorporated that into my diet regularly and my pouch enjoys it.
example:
Morning: A bannana+probiotic+vitamin d( I like to not eat too much before work instead I have a large lunch I've also read low vitamin d Is usually common in pouchitis patients.)
Lunch time: Large plate of rice with either beef or chicken and a veggie or two, usually this is bok choy, carrots or broccoli. + a probiotic, I use to take a digestive enzyme and beano the first few months and that seemed to help to the point I'm fine without them.
Dinner: Rice+meat, sometimes a veggie but usually fairly light on the veggies this late.
Before bed I take a pepto bismal tablet or two and one immodium.
This is my work week schedule, on days off I will usually eat more diverse foods like sushi, curry, perhaps chips, etc just staying clear of gluten and using rice as my bulk up agent, I also apply penaten zinc barrier fairly often, atleast once a day to my behind to be totally burn free, anyways I'm sure you'll find what works for you, good luck, I'm also only 3 months out and I hope to include more veggies in the future.