I have some cheapo regulator (I got my setup for free). I used to do all my adjustments from the "needle valve" (it isn't exactly a needle valve, but does the same thing differently). Anyway, I found it once I got close, it was easier to use the regulator to fine tune. It just gives you another reference. I can just use PSI, and my drop checker and not really have to pay much attention to my bubble counter. Only when something seems like a problem do I go to the bubble counter (someone accidently or purposely changed something while in my room). That is how I do it personally.