How long untill I can really Flog them Hard

To be safe, i was recommended to run mine moderately for the first 100 hours (i had some bass drivers replaced). Damage to drives is also sometimes done by underpowering them. In your case, i cann say of course, but since you like volume, that is just a consideration. the 802D can definitely eat up a lot of power.

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...

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?

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!