KaiserSoze said:
A week or so ago I got frustrated and just put it in the case for a while. I'm waiting on a new pickup anyway.
Took it out a couple days ago and plays great. As usual, I'm waiting for the buzzing to start because the neck is moving. Short story is that I've played it a lot the last couple days and nothing has moved. Usually I would have had to tweak it several times. I even changed strings yesterday and it required no adjustment, which it normally would have. Huh?
There's a certain amount of hysteresis to neck geometry adjustments. In other words, a complete response will lag the stimulus by some amount of time, which is variable depending on environmental factors. This is why when adjusting the truss rod, you make small adjustments, then wait to see what the effect will be. You make small adjustments so you don't overshoot your mark. You have to wait because while the neck will move right away, it takes time for it to completely catch up to the new tension and equalize. If you overshoot your adjustment, you'll have to back off. You can chase your tail forever by being impatient.
You say you've put an oil finish on this Maple neck. I'm not convinced oil is a suitable neck finish, particularly for Maple or Mahogany, but Warmoth says it's acceptable, so I'll defer to them. They have a vested interest in what they recommend, after all. But, I'd wager they mean a good hard finish of oil - not just a couple coat wipe down. My guess is it would need to be many coats applied over time, so as to create something somewhat impervious. The "hard" impermeable finish those woods need.
I have 10 Warmoth necks here, all different species. 3 of them are hard finished, 7 are raw. All of them are rock steady. Over the years, I've owned, played or worked on many, many guitars, and unless the necks were being frequently adjusted, they rarely needed adjustment. This is in Michigan, where temperature and humidity vary quite a bit. The only time I've seen "haunted" necks was about a 100 years ago when a buddy and I both refinished some guitars with oil. Long story short, we didn't do a good job. Two of those necks were Mahogany, and one was Maple. To say they were squirmy little devils would be an understatement. They were like agitated snakes. Needed constant adjustment, and the damn things never would tune nice, although the tuning thing had more to do with the crummy hardware we had to use back then.
So, I guess my recommendation to you would be to get a hard finish on that neck, and calm down with the adjustments. Make a small adjustment - I mean a 1/4 turn or less - and wait a few days. Roll some more in if needed. Eventually, it should normalize, and you won't have to mess with it any more.