I use a sponge in a butter tub lid and haven't had any issues with getting it up in mine. I know some people wet a sock and put that it in to get it up. Remember it's the wet surface area that counts....not the amount of water you add, so make sure you've got the water in the tray in one of the bigger spaces...not a narrow one. It you just can't get it any higher, 57% is probably going to be ok.