Well I made my Apogee full range ribbons work in a 10 X 15 room and everyone said it can be NOT done, when I got a new place, my room was much bigger and there was subtle difference but better difference since the Apogees need lots and lots of breathing room, the treatment cost me a fortune but it worked to my liking.
If you do the math to be honest, you are better off revamping the speakers cause I believe the Hales T5 can NOT be toed in too much compared to most speakers and its big too and therefor you sweet spot if going to be far off behind. The distance between each speaker is going to be a trick as well with the Hales. Try it and see if it works, dont give up easily. If you can kill all the standing waves that the Hales is producing based on its volume then...... shop around for something new with speakers. If you ceilings were higher, at least something like the Martin Logan Aerius would work well to but with 8 feet heitht to work, monitors would be the best and dont be fooled by people with the full range sound and size of monitors, I had may big boys before including Wilson, Apogee Divas (my favourite) and now I actually prefer monitors for long term listning compared to the monsters.
Get a good high performance monitor and you will be in that room of your most of the time. Good luck with in.
And if you can, try looking up for software room acoustics and read about on them to get a better feel of the room.
It works sometimes.