I’ve been there, Tried both methods to gain performance. Putting a high performance valve in the AF guns is dead certain to get you maximum fps. It raised mine so much I started shooting slugs, and this was several years ago. Rest assured Tony hasn’t stood still in squeezing performance out of his trademark valves.
Was thinking that my talonp was lacking power, then I removed the o ring from behind the tophat, power found.
I ended up adding a cut and recrowned 16″ barrel, and have a nice little powerful gun.
Shoots up to 65fpe with NSA slugs, though I am finding 58/9fpe to be more consistent accurate wise, though only shot out to 45yrds, will do some 100 testing soon.
I will probably not add the sho valve to this one, but want to build up a .30 cal Condor or Talondor depending on what gun I pick up next for the build.