How long untill I can really Flog them Hard

if you need to crank it up to get fullness of bass...i would suggest you consider a superb sub. Set it to stop playing above 45hz for starters...i find that with the sub on my system, i can play at volume 1 of 100 on the preamp...i would never go past 65 by the way...and still be superbly satisfied because drum kicks still manage to hit me quietly in the chest...way cool when done right. (My speakers are Wilson X1/Grand Slamms.)

and you wont risk blowing speakers or overdriving the amp. I would run the sub in parallel...try Velodyne DD18 for example...would work well potentially in room your size.

my 2 cents...

i find the bass quite adequate. especially compared to my Bose 901s i had previously. i find its the mid and treble that needs the wattage to liven up.

Ah okay, i was just chiming in on your comment:

"...I like to get them to that level where the speakers sound full, bass is kind of empty until they get around 200-250 RMS behind them. about 75% bass driver excursion..."

On mid/treble, if you need to crank to 'liven' it up...i tend to think of source first then perhaps pre or cables. The reason is because generally treble/mid does not pull a lot of juice from the amp...so if you are cranking it to really feel it...it might be that your ear does not feel it is getting a balanced delivery of the spectrum at lower levels...? A guess?

Im no expert by any stretch but the only was i can size this up is to say that it seems the bass slightly overpowers the mid and treb until there is more volume. i have a hard surfaced room so i dont think its absorption. i dont have bass droning in corners etc to amplify bass. its more of an opinion i suppose.

hmmm...interesting...to be fair, some speakers do 'come alive' with more juice. It would not surprise me if yours were one of those...lucky you have a fair amount to spare. Enjoy!