Sounds like you just need to try a different cover.
Something to keep in mind, particularly when you're discussing fitteds, to get trimness you sacrifice absorbency.
I'll also point out that most baby clothes are not cut to cover bulky cds, so other than dresses or overalls, you're liable to have some cd showing.
All that being said, my Rumparooz are the lowest rise dipe w the most absorbency. They're a OS pocket w internal gussets to contain poo. I keep them snapped down so they're pretty low rise on my guy, they sit under his belly. But they are bulky when stuffed w both inserts.
His trimmest dipes at this point are the new style Dream-Eze (white w black snaps). They're all around trim with good absorbency, but they're a fitted. Definitely not my favorite, but a good solid dipe.
But then you need a trim cover over it, and pretty much none of the OScovers are going to fit that bill. I really like my Imse Vimse, but find them to run big, so i'd size down. Or you can get a custom cover, i have a wool one from Pipers Closet that I love. Or of course you could ditch the cover and the pants alltogether and put her in longies. Kozy wool makes theirs to order, so custom sizes are easy and you can get any color/design combo you want. I buy them through a co-op for a good price.