There reaches a point where more mf not help b/c it gets compressed and leaks. If the pocket worked well, swith a mf for hemp and you will be set! I love the Babykicks hemparoo inserts for pockets and just add 1 mf over them to absorb quickly. I also love the flip organic inserts. They are great for nighttime for DD2 but I don't think she is a heavy, heavy wetter.
I'm glad you found something that works! We use the Kawaii overnights as well, double stuffed right now but I used to have to triple stuff them. Sometimes I will substitute a Rumparoos, but I still use the Kawaii inserts to stuff it because they are awesomely absorbent.