I am glad you like it.
There is a reason why I called the second stage HPR (High Performance Regulator).
With the HPR you have the ability of making three independent adjustments: the lever height, the spring tension (which can control cracking effort), and the amount of venturi assistance.
I am just about to write some more details on how to adjust all three, but here is a little advance information. I have shared most of it in other posts, but I will add more.
Note: I just designed a new flow diverter for my DSV design, that allows me to take full advantage of the maximum venturi flow.
1) The lever height adjustment is kind of intuitive. You use the nut on the seat carrier to adjust it.
2) The spring tension can be reduced by backing (unscrewing) the HPR body in increments of half turns (180 degrees). Cracking effort is fine-tuned by balancing the spring pressure against the IP.
3) The venturi flow can be adjusted, by changing the ratio, of the amount of air in the jet pointing down the horn, to the amount of bleed air going into the can. The adjustment is done by blocking the side bleed air ports to the desired amount. I will expand on this.
From the early design stages I tried to make the HPR a very adjustable second stage with ability to push the performance...