Jon, first of, congrats on your Logans ! A long time di-pole guy here. How old are your reQuest's ? Do you clean / vacuum the stat panels at least once a month ?
Placement...placement...placement, any di-pole is very critical of placement within a room. They need room to breath, 4-6' out from the wall(4' being the min IMO). Did you use the flashlight method for toe-in ?