Green springs, eh? I'm surprised people here even know what those are haha kudos for needing a 30 din!
But honestly, what do you think turning them down does? I'm curious. In your case especially, the lowest setting is still a comparably pretty large amount of energy in the spring itself and turning the down does literally nothing. If you have metal housings, the pressure they "notice" from the spring is none and I assure you it's wholly inconsequential. Turning them all the way down is still FAR away from 0 pressure, which ideally turning them down as a storage measure would theoretically be desired.
I mean hey if it makes you feel good then do it, but don't do it because you think it's prolonging the life of your bindings. You'll likely strip your worm screw from turning them up & down before your housing will crack from the spring pressure FWIW.
I've never personally seen even a plastic housing blow from the spring pressure and never seen an example of it happening on the internet either, so I fail to see the need to protect my all metal bindings from themselves tbh.
But hey, everybody's got a ritual. Don't let me stop you from doing yours, it's not hurting anything unless you forget to turn them back up :)
Grammar: the difference between knowing your shit and not knowing you're shit.
I don't want to believe, I want to KNOW. -Carl Sagan