Have you ever sighted down the neck of your Sadowskys? It may be the same on yours, too. I don't really see it on the G string side, but it's noticable on the B string side for sure.
Between your NYCs and Metros, do you find that you have to set up your metros more often because of the lack of graphite reinforcement? It just worries me a little here in the wet state of WA where my motorcycles rust despite being kept in a garage and never seeing rain.
I've certainly sighted down the neck, and I'm like you in that I try to get the neck as close to flat as possible, though I generally like medium/high action. I remember when all my Sadowsky's arrived to me that they all had very low action with no buzzing. Not my thing, but yet they seemed to take to that setup. I"m very aware of the bump that Rob is talking about in older Fenders, and I never really noticed it in my Sadowskys, Metro or NYC. Now, this is keeping in mind that I DON"T actually have one in front of me to check, keeping in mind what you've said. FWIW.
As for weather differences, that might be a big factor here. I"m willing to wager that OK's climate is much more consistent and drier in general than is WA. I will say that whether I had an NYC or a Metro, I always seemed to need to tighten the trussrod occasionally when the weather changed from hot/cold. Other than that, no worries.

