Boy oh boy... And all this time, I thought I wuz talking high flow.
Well, it's some consolation that building "overkill" in the heat department, is a philosophy that's "ready" for more flow. I haven't tested my "Unleashed" systems with jet sizes larger than an effective 06. It will be interesting to see what happens when some of the owners of them do...
I do remember Paul Brown running a test on a "Hammer" I built back in 2000 or so, with a Rotovac. It delivered 265 degrees at 600 PSI, if memory serves.