Interesting info. Are you saying that you're running it solely off the hot supply with the temp down rated to showering temperature, or are you still mixing cold in at the shower?
The installer said "just try it", so I didn't make any changes. Cold is still coming through the venturi nozzle, however it is now at a lower pressure, as the installer fitted a pressure reducing valve near the water meter (all cold taps in our house are on mains, so the whole system feels better balanced now). I think the amount of hot in the mix is now much greater than cold, however it is still possible to vary the showering temp by a certain amount, by using the control on the Jetstream.
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