I have hot forced air heat that shares the same registers as the AC. are there some registers that work better than other directing the heat down are all of them pretty much the same.
Curved blade grilles allow each blade to be adjusted,though I doubt this would help a comfort issue.Whta problem are you experiencing??
We use 4x12 for heat in ceilings and if you have the round Hart and Cooley then anything will be better.