I have recently taken out the stock replacement grip and put in a babolat leather grip with a wilson pro white overgrip which has improved on the feel of that ball and which has also improved on the overall gripsize/grip shape that head unfortunately uses.
I play with the prestige classic 600, with one overgrip over the original head calfskin grip. I also add 5 grams of lead at 3&9, i find it to add stability and power without losing any racquet head speed.
I'd say they do a little bit. But it's hard to really tell because they have such different shapes. I agree with you that head grips feel a little smaller than wilson's.
the weird thing was that when i had a prestige in a 4 1/2 is seems bigger then my radical that is also a 4 1/2. do you know where i could get pallets for the prestige classic mid or pc600