Im 6'4 and found a good spot that works well for me. Which is why I really wish it had memory seats, because my 5'2 wife gets in occasionally and royally messes things up haha.
I dont hit my head or even come close. My complaint is my view through the windshield. Im looking through just below the blue strip. When sitting at traffic lights, I find myself peeking under to check them.
I could stand to be an inch or so lower. But I dont know if its bad enough for me to go changing things. Im hoping to pick up a new driver seat soon, and when Im swapping them out, I might look into it. Maybe Ill experiment with the original seat, since its not worth much. See if there's any room to cut/re-weld the brackets maybe.
If I come up with something Ill surely make a thread!