Oh I see. Tell us what you are trying to do. Just get a little more FPS or a LOT? If the reg is set maybe 145-150b already, you might just be able to go in on the HS and gain. On my HUMA I know CW increases the pressure. But it is installed backwards compared to the FX reg.
This may help you.
https://www.youtube.com/watch?v=yUnjg8ofNt0
Once you test the reg where it is set now and increase the HST CW until it goes up and then begins to fall. Then you back out just a bit. That will be the max for the reg setting. If that isn't your target fps, then you will have to go up on the reg to get any more.
And, just a little goes a long way. Add a little reg pressure, reassemble and back the HST out and start back in with it over the chrono until you reach max speed again. Shampoo, rinse. repeat until you have the target FPS.
So CW increases HST and Reg pressure. CCW reduces both.
Does that answer your question?
Crusher