Given 2 120 rolls of Russian 'SVEMA FD 64' film, I had never used it or know anyone in UK who has used it so I tested it in FX-4 Formula 1+1 and guessed 9.5 mins @ 20oC . It was badly FOGGED and BLOTCHY but on the large neg does not show so much - I rated it 40 ASA
Well done. So far the outcome of my own experiments with outdated Soviet films hasn't even come near to your surprisingly good results. I shall have to give my last few rolls of Svema and Tasma a chance after all.