don't forget Si there are other variables, your spring is a SFS spring, probably different to the springs from a vmach kit..
might have tighter coils or thicker steel or something like that haha
its all very scientific isn't it
what I will say is, as standard and self fettled both my 97's were very smooth.. the .22 more so, and very easy to cock with the .177 considerably more effort was needed to cock it.. both close to 12 FPE
but at 8 FPE yesterday the .177 was nearly cocking itself it was that easy!!
and it does seem a lot easier to shoot at 8.2 compared to 11.8 a lot less r