Steve you say all the voltage above 2volts is making steam?
Then all the foam is totally relateable to steam?
If so I do not understand why the steam is in small bubble form.?
That foam is like an entrapment of a combination of process, steam, and hydroxyl.
Maybe I should try to get the pump connected and check but I think there's plenty of hydroxyl locked into those bubbles.
Will have to work on some connections to pump in and or out in the near future to learn about this foam stuff more.
Its a parasite and everyone using multiple tubes has ran into it, I'm sure.
(Maybe a good test would be to connect the tubes in series?).
Many things would not make sense if its all steam, why are people making hi-voltage alternators for tube sets.
Its not all steam! (Needs to be looked into some more).
Steam or watervapour.
Thats all you get above 2V.
Dont forget....you do electrolysis and nothing else, so all the laws for that proces count.
The funny thing with wfc's is that if you apply a higher voltage, your wfc will pull more amps and thats good. But your efficiency will drop dramatically, because all volts above 2v create watervapour/steam.
At the end, you will have a mix of HHO and H2O. Its burnable, but not comparable with a wfc who is doing electrolysis between the 1.5 and 2.5V per cell.
Because you work with electrodes in a BIG bucket of water, the temp will not rise very quickly. The heat is consumed by the water reservoir.
I had the same foam, and if you burn that foam, you will get a big bang, because of the hydrogen, which is trapped in there.
About Bubz point, i had 3KV across my HHO gas and i didnt see any change in flame color, height or temp.
So, what make you think you can ionize hydrogen at 12V and what would you expect as results?
Just curious...

Steve