Been playing with a used PP700 I bought.
It’s now Huma regulated, was set at 90 bar

No matter how much hammer adjustment, it wouldn’t go over 3.5 fpe.

So I stripped it out, set it to 100 bar, same story, but now 4 fpe.

The transfer port is backed out on the breach, the reg is fitted properley and can breath to atmosphere.

I’m a bit lost for ideas, all I want is efficient as possible at 5 fpe.
Any thoughts welcomed!