I drilled the orifice out from .04 to about .06, and got much improvement in the flame. I had to open the air shutter all the way, which makes sense. I added a ball valve downstream of the Honeywell valve, but haven't tested it out yet.
I'm putting together a single burner system for a recirculating BIAB setup. I took the Bayou Classic burner and added a Honeywell gas valve and 11" WC regulator at the propane tank. I haven't tried boiling water on it yet, but I wonder of the flame is big enough to boil 10 gallons in a keg...