TarheelsRule: Tee locations in ranked games are more or less fixed by your level
You'd think the greens supy would move the tees a bit each day? They're getting all beat up WGT! Just take a look at BPB #14
If adjusting the hole lengths is impractical, how about mixing in some blue, white or even red tees in with the black tees? Of course all tee boxes would be the same for everyone in the same tournament. Just another way to add variety.