I don't have any advice but I'm there too. We've pretty much been using 70% sposies/30% cloth since Isaiah's been here and not one rash! But when I try to use cloth 100% they get a rash within a day or two. I had the same issue with DD2. I do think it's the wetness factor for us. We don't have quite as many problems when we use pockets and change very often. I don't know that we'll ever be able to use cloth 100%. A good compromise that was working before I had DS2 was using cloth during the day sposies at night and that minimized rashes. Hopefully we'll get back to that soon.
I'm going to assume that you've tried different detergents but that's always our biggest source of rashes. You said you feel like there is less rashing with the cotton AIO's? If that's the case, then I'm inclined to think that it may be the synthetic fibers of the fleece that your LO is having problems with. I'm also wondering if perhaps flushable liners would be a good compromise instead of going back to sposies. Ultimately though, you'll know what's best for your little one's skin and if that's sposies then nobody will blame you for making that choice.
If you do look for a CD friendly cream, the diaper salve at Northern Essence has ALWAYS been my favorite.
If you put a liner in the diaper, you can use desitin... I have done it many times and had no absorbant problems.
-Becca, mom to Jacob (5-3-2003) Zach (6-20-2006) Zoey Jane (2-6-200 Alex (8-11-2011) and Baby #5 due Jan. 2014!!