I was wondering why the SS16's are recommended; I figured that it would take 20" stands to reach ear level on my couch. I have heard that some speakers can sound better when slightly below ear level than above.

Well I got the 16" stands for my M22s and they're fine.. the vertical dispersion of the speakers makes it difficult to tell the difference between ear level and a few inches above. Don't forget that center channels are tilted up or down to the seating position, which makes it less critical to match ear height with the mains.

If it sounds good how you have it, then don't worry about it .