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.