Yesterday I pulled to inspect the hammer spring in my PP'd 30cal and it was the shorter, assuming the one that came with the kit. Before the velocity was 960fps at 140bar with the HS wheel on max. I replaced that spring with the longer one that came out of the gun originally. Really helped it a LOT? Now at 140bar it gave me 1010 and I did have to back off the small adjusting screw to allow the power wheel to operate from min to max. My regulator had creeped up over night to 152bar so I thought I'd see what velocity that would give me. I believe it was 1040 something and the next two shots as the regulator settle back in were in the 1020's to 1030's which tells me there is more power easily available if needed.
Waiting on more slugs I decided to tune it down for 44.75 pellets and I ended up at 96bar, on the Min setting and on the second line to get it down to 880fps. Amazing as to all the options the Impact has.
Jking