[RedDevil]

Yeah, well again the idea was that a fraction of HHO seeding improves the combustion speed by way more than its own percentage; or it would result in a more complete combustion; both effects can potentially yield more power.

Whatever happens, in an unmodified engine there are no real gains to be had.
It could be that the ECU needs remapping (which is worth investigating IMO).
it could be that the effect does not work as envisioned.
It could be that the effect is there but not operating controllably, destabilizing the combustion process. forcing the ECU to use a safe mode or such.
Maybe it just needs some tweak to get working fine.

It is these uncertainties that need addressing.
Most of all the idea that a little bit of HHO has a disproportionally large effect on the combustion speed or quality, as that is the extraordinary claim that needs extraordinary proof.
If there is no hope of that ever happening, and no physical proof of concept like an ABA test appears, then it is not unreasonable to relegate it to where we keep the stuff of fairy tales.