My boil is vigorous, but not ridiculous. I have had to adjust my boil-off rates in beersmith to compensate for the lower rates. I have put over 100 gallons through this system and my beer has only gotten better. My flames are still not very high using the current regulator, but it does not seem to affect my process that much. I have found that when i run to burners at the same time, i have reduced flames on both burners. I may try to change out the low pressure regulator for one that has a few more psi (maybe1 or 2 psi higher) to see if that makes a difference. I am limited to how high of pressure that i can use because my HLT is controlled through a Honeywell valve for automatic temp control. One thing that is a absolute must for these burners is a good wind screen, with air inlet holes added. I love the fact that I can carry on a normal conversation during brewing with both burners running. If you are running just a single burner at a time the regulator form williams will be fine. If you have any further questions, please let me know.