I would also look into a better isolation system for the speakers -- when I had Q3s the Townshend platforms worked really well. They completely isolate the speaker from the floor and cut out bass transmission via the floor. I have M3s now and the M-pods do the same thing. In either case you get a much cleaner more realistic presentation.
Regarding room treatments use of Synergistic HFTs is recommended -- treating the speaker cabinets alone is worth it but a full room treatment is low cost and very flexible
Finally I'm surprised you don't have any toe in on the Q5s -- unless you are listening really far away I think a bit of toe in will help with integration.