When you say it isn't easy to grip as your HR, do you mean it's more slippery or it's not as comfortable to hold?
I don't think it'd feel better if you scuffed them up. If anything, wash it with warm water and dish soap and scrub it with some very fine or worn down scotchbrite pad, it should make it a bit more tacky I think.
It feels slicker...My howling rat and camp tramp have the tacky/super fine sandpaper feel. I got the SS4 unused from someone and it has always felt a little slippery. I'll try to wash the sucker and see how it feels. Thanks!