AndyJB, you are not alone, I see the same thing, Shocks having more turn and harder fade than Volts. I was puzzled and now it is solved. I have 7 "old" Shocks and not sure if I ll use them in bag as I prefer Volts and would prefer new Shocks as well.
In PF MJ Contender bag on Bag Boy Quad: Anode Zone Fuse Tangent Axis Vector Amp Volt Shock Villain D4
"You just can't have a doubt in your head." - The Hammer