I have had problems in some shelters not letting my head brush the tent over my head when I sit up, and I'm only 5'3" tall. I don't know how you tall guys manage!

I know that quite a few tall folks get a 2-person shelter and sleep diagonally. I also note that there are increasing complaints from you tall folks and that at least a few "cottage" gear manufacturers are responding. On the other hand, "standard brand" tents appear to keep getting smaller as their manufacturers try to make them lighter.