Just My opinion, But As far as some butt woods are concerned I feel as If they are properly seasoned, that nelsonite is not always nessesary. I Know this does not apply to all woods, but since My time spent is limited, the butts spend alot of time hanging around between turns, and seem to be holding fine. They do not seem to need it. The wood I have for them, I have had before I had any equipment to speak of, and It was at 6% back years ago when I bought some of It.
The shafts are another story, because I do want to get a larger yield from them, and they seem more prone to movement due to the diameter. I have had to purchase My shafts so far, because I did not start out with shaft wood in the begining, but of what I turn Myself, It will take some time seasoning, and are being dipped. I am not taking any short cuts on the shafts, and in fact will let them season longer then most probably. If that meens I Have to use others shafts til then, then so be it, because I feel the shaft is one of the most important componets of a cue.
On the question about shafts in nelsonite, I have played with both dipped & non-dipped, and have noticed no noticable difference in deflection. That seems to have more to do with the wood used. tightness of the grain, and the straighter the grain the more consistent the hit from around the diameter of the shaft seems to be, but that is just My observation. Also the hardness of the ferrule and tip seems to play into deflection I have noticed. Without even looking at the grain, I can almost tell how dense a shaft is by the weight, and when I face the end of one I can see, and feel the difference.
BTW anyone have any tight straight grain for sale

Probably not, but figured It was worth a laugh.
Greg C