I have continued collaborating with Frank and Harper on this - the configuration has evolved quite a bit, which Frank will talk about at ICCF-25. But I'm sure that he won't mind me telling you all that it is no longer a gas-spaced cell, but uses an ionic solid spacer, and that we are currently working on pre-treatments - surface conditioning of cathodes - so they have hydrogen-loaded nanotubes growing on them. Cheap, easy and all 'green chemistry.'
For @THH's comfort I should mention I have seen other systems where you think you have an anomalous effect, but when you keep digging and improving your systems the effect gets smaller and smaller. The difference here is that the effect gets bigger and bigger.