Spinnaker luff tension

What are the affects of spinnaker luff tension eg. more tension allows you to reach, less tension for deeper sailing? I'm still a little vague on how this works. Intuitively I would bag the luff for deeper sailing but from what I understand this may not be the case. Still trying to get a solid answer on this one.

--
Daniel Evans
N I20 Miami FL
N I20, N 6.0NA, H 20, H 16 Chesapeake bay
I have a hard time passing up a good deal on a big cat.
--
more tension allows you to reach, less tension for deeper sailing?

less tension will actually allow you to point higher but you loose speed by doing this too

If i am in a place that requires me to point higher (shallows, or being in a restricted area) i will drop the head of my spin 3-4" (&/or my tack line a few inches) and this will let me point higher without my spin luffing (as bad), but t his is slow and at some point so inefficiency you are better off snuffing