will
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Gopher,
Your speaker looks beautiful. Not that this is not something you have thought of, but the first thing that occurs to me, is that it is a complicated set up with a big crossover board and many drivers. So more than just drivers (which is not insignificant) need to break in. My HR-1s took quite a while for the drivers to loosen up, and even with its simple and flow through crossovers, they too take time, the end result being a more dynamic, refined and flow through presentation.
Have your 6AC7s got a lot of hours.....say 150 or more. If so, in the context of the polite speaker, you may find the russian OA3s less offensive and they may punch things up in the areas you want. Alternately, a more refined, but clear OA3 is a Jan Sylvania ST 1981 from tubeworld. Very clean, but smoother, more refined, and better sound stage than the Russian, and pretty cheap. They should punch your dynamics up increasing the upper mids too with their increased push over OD3s.
But first, I would get on Ebay and try to fine some tall bottle Sylvania 5U4GB blackplates with an off center top hallow getter. The ones I have have orange letters on the base. They are probably a bit warmer than your STs but will give great texture and micro detail, especially waking up the mids/upper mids with spaciousness.
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