I am not sure I understand why a premium air rifle apparently needs so much work done to it before it will work properly.
Just vorteked my HW97 on Friday. The SPROING is completely gone! Accuracy and power speaking, it's improved. Recoil is still there because of the nature of springer.Now I can't hardly wait for the break-in period to end.Must agree with breakfastchef , if you shoot once in a while, no tuning with HW97 needed, probably no HW97 needed either.Keep shooting SAFE and HAPPY.
Paul Watts put a JM kit in mine and did a full tune. Not only is it quieter the recoil is almost gone. I use CPLs. At 10 yards I get one hole results. Not hold sensitive either.