I had a bad experience with wonderoos also. Leaked terribly. I SO wanted to like them. however, then I found the Fuzzis and BG and wouldn't change either really as they're both great.
Lackadaisycal re eczema, I'm sure you've tried all sorts of things, and this is so obvious, but, have you tried washing the nappies in a really mild non bio liquid? I switched to ecover washing liquid as dd had horrible nappy rash. Was initially caused by thrush and then went on a bit. She was teething which is usually the only time she gets nappy rash. Anyway, it did actually make a huge difference. I also use a great cream from neals yard, and another from weldeda - calendula main ingredient. that pretty much sorted her out in a few days. The neals yard cream is in a huge tub and pricey, but has lasted me well over 6 months if not more.
JUst that I went back to disposables for a bit and it actually made er worse. In fact, every time I change when we are traveling around in hotels with DH from time to time, se gets very sore immediately. I've found it muc better to stick with the washables and use the liquid and those creams. I know eczema is not quite the same, but it can be allergy related so might be that which is the problem...
Oh, lastly, if the nappies are particularily stained or, about once or twice a month, I wash them all adding the ecover laundry bleach to the powder compartment, it just brightens the inserts up again, and is not actually bleach at all, all natural stuff.
Hope you can give it one more try maybe, with the 'tips' i've given you. Would be a shame woudln't it. I know how you must feel about it. I'd hate to have to go to disposables now. I hate it when for a few days!
HTH