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.

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
MN3
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