FWIW, I bought a stash of Svema FN64 a while back and tested it with a few developers, although I never tried the CT-2/Agfa-12. I found that Rodinal 1+25 for 6:15 at 20C worked best. Rodinal 1+50 for 10:30 and DS-12 2+1 for 11:00 also worked quite well. Surprisingly, XTOL produced hideous results. Density was good, but the grain was awful and the development was uneven. I don't know what went wrong with that combination, but it wasn't a one-time quirk (I got bad results with one roll and so tried a test with part of another). I don't know how similar your Tasma film is to the Svema, so my experiences might or might not be relevant.