Don't think I'm crazy but...

~~~~That is a big room. If you want more volume you have to move more air, be it more driver movement or larger drivers. Both have a trade off in accuracy. The Infinity RS1's in my set up allow a large volume of air to be exited with speed.

Just The Facts
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Higher efficiency will definately help your problem. I use JM Lab Electra 926s which use WAY less power than my previous Paradigm Reference 100.2s. My McIntosh meters never read more than 50W even when I have it really loud. At that same SPL, the Paradigms used 150W+. Look into Electra 936 or 946. They have clean clear sound like Thiels but more musical in general. Good luck!

Several problems here:

1) That's a big room and will be hard to pressurize.

2) Your speakers lack surface area ( drivers ), sensitivity and are of low impedance.

3) You bought a Bryston amp. If you want to know what i mean by this, look up some of my previous posts here and at AA about Bryston's inability to drive low impedance loads with authority. While I had stated this several years ago and others thought i was nuts / just bad-mouthing Bryston, Stereophile confirmed this with their review of their 500 wpc @ 8 ohm amp*.

4) You need more efficient speakers with more surface area and a more versatile amp. Sorry for the bad news. Sean
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* Could someone please make Stehno aware of this fact. Contrary to his ideas, the multitude of "generic statements" that i make aren't just "random thoughts tossed into the wind" or a "plot to undermine and destroy" certain companies and individuals. Most are well researched ideas based on personal experiences & logical deductions arrived at through careful technical analysis. As time has proven, many of my comments are quite often verified by outside sources at a later date, much like the situation here.

I used to be a volume nut too. And a smaller pair of Theils (I think they were 1.2's) that I owned left me unsatisfied. Now with larger speakers that can go deeper in the bass department I find myself not needing the volume as much. I'm sure the big Theils that Mstram mentioned could play loud with a large enough amp but the bass would still be on the weak side.

If you want to keep the thiel,try the Stratos Extreme
Monoblocks Oddyssey, this are the best combination
I have ever heard,The krell FPB300 dont match, a bit
bright,the X250 are too dry dont match.The stratos
musicality is really good,Hope this helps.