Thanks to both of you, this is a good start to what ultimately will be throwing a (possibly semi-costly) dart at what is pretty much a whim project. My general go to caps are Cornell Dublier 940-C for "nice but affordable" and Mundorf Silver Oil (not gold) if I'm feeling "urge-to-splurge" but they have vague reputation of not holding up particularly well in higher heat so hadn't really considered them for this use. I doubt the 940's will improve over the Russian PIO.
The Miflex look interesting, but appears they are rated at 70c which might be of concern mounted inside chassis near a quad of KT-120s. Are you using them in the coupling cap position and if so how long have they been installed?
(besides the temp rating they are right at limit dimensionally and their thick leads will require enlarging through holes .... Hmm, multiple flags going up, I think the world is speaking to me)
The V-cap TFTF's are being discontinued and available at 40% discount which is very tempting, going to look at those a bit closer. Correct value might be sold out, will check with vendor this week.