I discussed the Peach Ylink MU at TO6
When you get Peach off stage, you really want to get her lower with projectiles, so she isn't high and easier to gimp. You can catch her turnips from behind because our grab box is the widest and boomerangs can lead into uairs.
Puff is just a big *** campfest, when I played HungryBox, I always had a bomb out in my hand and boomerang to keep away. Only grab if you absolutely can, and after you get your combo you can only really rinse and repeat. Poking with nair and bair is good too.
Sorry if I'm not making since.