I would ditch the JW valve and try 115 lows, 25-30psi popoff, 120 highs. The low screw around 1.25 out and the high maybe 1-1.25 out.
Then only open the top screw on your B pipe, and open it about 5/8 turn.
I can't say it'll be perfect, but I bet that would work NICE :biggthumpup: