There is a lot wrong here. 5.1 historically wasn't even mixed as an ear level channel. Most dubbing stages never had surround speakers at ear level. That is pretty much a newer thing that came with Atmos. Even still, I don't see ear level speakers in modern dubbing stages. Bed-layer speakers are usually elevated a bit above that point.
The original poster is not able to use bed layer surrounds in a placement level with the ears. That means either he reserves the ceiling speakers for the rare Atmos mix for some occasional height effects without any bed layer sound support whatsoever, or get actual surround sound which absolutely will be in sound mixes for any movie made in the last 25 years. Traditional 5.1 or 7.1 doesn't really need to be very picky about placement, since its usually just ambient noises with a few effects sounds here and there.
Also, the line about larger drivers sounding worse than smaller ones is pure nonsense.