Thank you for the feedback! A few quick thoughts.
We know Rossi used nano-diamonds as well as graphene in some capacity due to statements in the court papers and depositions. They were vague, though. But I think they could be useful in generating EVOs. My guess is that in a powder based system they might even be stimulated by RF energy in addition to heat or SPPs that might roll through the fuel mix.
I also think in the final RF reactor a percentage of argon or xenon mixed in might be useful. I've read a statement in a paper about spheromaks that even the addition of less than 1% argon or xenon to the hydrogen environment of the "gun" increases their internal magnetic field and stability 10 fold. I think that in many of Rossi's systems he wanted to bombard this fuel with these structures. And, even if we don't get direct strikes, they can continuously emit showers of energetic electrons that could induce SPPs on the nickel.
About the QX: I think it is a more classical spheromak fusion setup using Li and H, which we know have some interesting reactions even at low energies due to the results from Unified Gravity Corporation and other researchers who have been able to induce fusion reactions at very low proton energies of 200 eV in some cases. My guess is that there are permanent magnets used that produce a magnetic mirror trap that tend to confine the spheromaks or at least bunch them up so they collide, compress, and inducefusion reactions.