OK, I have NO idea what 82% of that means, but I was told not to calculate with 92 room sens. and I use the Crown calculator since thats what 3 different sources told me was a good start...
I have the speakers in front of me and I know for a fact they need more than -20 watts to fill the room... When someone is looking for more power its probably a good idea to get it, If the OP was only putting his avrs volume up 1/2 way he probably wouldnt be considering a sep amp...
As far as the BS comment, I apologize, I am recovering from shoulder surgery, on pain meds, and went from smashing the gym 2 hours a day 7 days a week since I was 17 to sitting on the couch for 15 hours a day, I have so much built up aggression my gums are bleeding... literally for some reason my gums bleed since I stopped working out...

And I cant stop taking the pain meds cause it is killing me even taking them, the dr said my shoulder was the largest he ever attempted to repair {normally a small scar, they cut me 8 inches}, but anyway, IMO the op should try an amp...