Maybe I would try on the 5th November
TBH I haven't used z-foil that many times , mainly RIAA network and loading but I wasn't overly impressed , obviously it all depends on application as you have found them superior in I/V position .Except Z-foil! Admittedly in the I/V convertor position in a Teradak Chameleon. I compared all sorts in there, inc. Shinkoh and Audio Note tants, and the best was... the pair of transformers I sold to Rabski!But the Z-foils were the best resistors.
I wish I had the intelligence to first understand and then be able to build one of these ,
I like the cut of your jib young lad. You shall go far with that attitudeA little perseverance and these things become steadily less unachievable. I speak from a decade of personal experience.