I have been listening to 8b’s for three years now. My room is 9 x 28, so quite a bit smaller than @jwr159. I am running a 20w Mactone-MH 300b tube amp, 300b in push- pull. I prefer this to the other 100w Von Gaylord Nirvana tube amp I own. 95db is easily achievable. Sorry no experience with the QS. But I can confirm that tubes are a great fit, and not as challenging a load as Maggies.
This is a total aside, but Bruce has come up with a 8c woofer upgrade. It’s a drop in replacement for the existing woofer units, but with a built-in plate amps, DSP room correction, a new crossover for the panels...etc. Any comments? I’ll take it to another thread, if the OP does not want the distraction.