I currently own the EJ DE89 & DE89L. So far I've not had any problems using either of my two razors. I've never had a difficult time with the grips on either of the two while I was shaving.
I've got the DE89L and have never found gripping it to be a problem.
I rub my wet alum block over the fingers of both hands after I have lathered, when I pick up my Fatboy, ready to twist it shut. My fingers never slip on the razor's handle.