Sharpness is not the problem then.

How about fewer passes? If I do 3 passes cut off my dermis! I have never been able to do 3 passes but most here seem comfy with it. May I suggest that you start with one or 2 passes befor you do 3? It took me a couple of months for my skin to get used to a straight after I started straight shaving again after an 8 year interval.