It sounds like you might have a problem with absorbency in the diaper or gaps around the legs.
We have one and it's cute for PUL. I don't love it as much as my wool, though, lol.
I agree you should try wool. It's wonderful! Our great grandmothers knew something we have forgotten! We use mostly hand knit wool covers during the day and Aristocrats at night....never a red mark. Aristocrats makes a superb wool cover!