Lot's of good suggestions. I would like to add Octave Audio. I have the V110SE with the Super Black box. This is an expensive combo but the sound quality is superb. The V110SE comes with additional input tubes to match the amp to your speakers and they can handle pretty much any speaker. The Black Box is loaded with Super capacitors to provide instantaneous and huge amounts of power. Read about it on their web site. While other tube amps can certainly drive your 86db speakers, the Octave with black box will excel at it and will grow with you if you ever change speakers. I'm using the Octave with Vienna Acoustics Beethoven Concert Grands, a beautiful match.
Let's do your check list:
1. Check, Great sound. I've only compared it to one amp on your list, Primaluna Dialog premium, and the PL is not in the same league as the Octave.
2. half Check, while not actually self biasing you just turn a screw and lights tell you when it is biased correctly, no meter needed, takes about 45 seconds to adjust all 4 tubes and once the tubes settle in you won't need to adjust more than once every few months, if that.
3. Check, great quality
4. Check, high quality remote for volume control.
5. Check, it has pre-out for subs.
6. Check, my Super Black box died after about a week, they replaced it, no questions asked and very quickly. The system has been flawless since then, about 16 months now.