Secret handshake INITIALIZED! I got the PART IV Docx file for Nexy's Diary series explaining development of rubbers. I think he will post that soon to hiz diary thread on MyTT, so I'm not gunna ruin the moment for him.
Rubber does not look to be in final approved stage, but I think it is gunna be miles ahead of their other inverted offereings.
I use Elpis on BH and it could also be an emergency FH rubber. Karis looks like it could be a FH rubber for me and I am very picky on FH.