Umm, I have an alternate view.
I adjust so that at hip height, it stays there. If I want
to lower it, I need to push it down. If I want to raise it,
from the midpoint, I push and it goes up. Actually makes it a bit
easier for the opener, too.
That way, if my wife disengages the door from the opener,
and starts to raise the door, it 'wants' to go to midpoint, rather
than to go down. And if she has had to disconnect the opener,
I don't want her to work much to get the door up high enough
to drive the car under it. I also don't want it to be drifting
downwards as she is backing out, because it wouldn't be apparent
from inside the car until she heard expensive noises.

willshak wrote in message
...
Someone posted some rule of thumb here recently. It applied to a roll up
sectional door, but it may be the same for your application. I'll
paraphrase since I don't remember it word for word.
When the door is hand lifted 1/3 of the way up and let go, it should
close by itself. When the door is lifted 2/3rds of the way up and let
go, the door should continue to roll to its fully open position. Adjust
the springs as necessary to get both results.