oh dear, have used them all day on DS and done the evening wash of nappies and the liners went in with them and they have baubled badly! I think it must have been high temp (60 degree wash) because one of the liners was heavily soiled. I usually wash at 40 but had to do it higher tonight.
I've no idea if wool ones would work (though you seem to have possibly felted them now by washing at 60!). Have you tried posting on the Nappies topic in the Products section? I'm sure someone with more knowledge and experience can advise you.