No experience with fitted, but the heavy wetter part
I just went through this. What you describing except he could wet PUL! He goes all at once and it has to absorb quickly. What I've found it that a layer of microfiber first then a hemp/fleece behind it to pull the wet back through his diaper. I made some of each but splitting old towels and indian prefolds in half. I serged them together and practiced a few days. I found that if I put the doubling layers in the right zone with microfiber first (closer to him) then the hemp. We had a winning combo. Not pretty inserts, but they work!
Also, I love fleece pockets at night. Never a leak with windpro. I think someone had some used SNAP-EZ here.
Sarah SAHM to William 4/05 and Emily 6/99 and blessed wife of Hank for 12 years!