Messing with the main (system) pressure will do nothing good. Been there done that doesn't work!If anything shim it up to about 90 to 100 psi and then find a way to accurately regulate control pressure. The stock WUR will not do it right. What was your control pressure anyhow?We have a bolt on system that works flawlessly and would sell you one for $250.
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Jeff- Can you send me info on that CPR setup? kendall at jonestechnicalgroup.com

Kendall