I too had the adjustable regulator, with the "boost compensation" from Needswings, which also allows monitoring boost/ fuel rail pressure etc through a Zietronics box. I set the regulator at 65 psi, and without any compensation from the system, it still wouldn't lean out. I was running about 19 psi boost, and found that any compensation would make it run rich, so on this current car (with 62mm pulley), I am going to see what happens with just an adjustable regulator/filter/pump replacement from Needswings, without the boost compensation, to see what happens. this was all with stock injectors, on a dyno.