Bhaur,
When you have time, let folks know what the ES and shot count is for you 60 FPE tune with new valve set-up.
I would need to know this is a No-Brainer modification before I attempt it. Right now my two RAW's work perfectly with the mods I have in place. The lighter hammer created by Your Open Air Valve would help to reduce shot cycle vibrations (helping accuracy) and wear/tear on internal components. Even though this new mod helps efficiency on the margin, it's not worth the work unless no other aspect of the gun's shot cycle is compromised.
As always, Thanks for your work and the expense needed to achieve it ...
Kirk