Huma regulator with pressure gauge on my 25 cal synrod

I have ordered the regulator but I do not know what bar I should request it to be set for, I believe it is user adjustable. I also will be planning to install a hill modified power valve and a new gauge( more accurate than the stock one). The hill valve comes with 2 springs one is med a the other is light I believe. First ? is how many bar should the regulator be set for and 2 ? is which spring should I use in the power valve? 3rd ? is should I use the 12.5 pound spring for the hammer or use stock or different or modify stock spring by cutting a coil or two? My gun likes JSB 39 grain diablo and Benjamin target pellets.
 
I had mine set to 130bar (will be double checking & probably adjusting 130-140bar).
That's where it looks like my .25 armada's sweet spot is (my huma should be here soon).
Shot string, here is where my armada is shooting w/o a reg:



I also run a modded valve, SSG, but I also use a lightweight hammer I made (19g, 25g & 33g). I'm using a very weak poppet spring. 

Hammers I have made (trying to find what weight works best with my poppet spring:















Usually, a reg will really shine when also matched with a lighter weight hammer.
Soon as my reg is in & installed I can give better info. 


 
lighter is better....springs & hammers.
Since the pressure behind the poppet is constant and at a lower pressure with the reg....you dont want to over power it with a heavy spring or heavy moving mass (hammer). Lighter reg pressure = lighter valve spring, lighter hammer spring & lighter hammer.....(to make the most out of your fill & tune).

Not too many people reg a .25 mrod. (I have only read about 3 other than you and me that are in that group).
Not too much info out there.....just what has worked on the .22 &.177s and "what usually works".
When mine comes in, I will report back and share as much as I find out about mine.