tfarny, the sales pitch for the Graphtech nuts states that the material is "self-lubricating". To me, self-lubricating means it does not required additional lube before use or perdiodically. Also, I don't think the width of the slots were too tight (I use extra-light gauge strings). The cut and prep of the nuts itself was absolutely perfect thanks to Warmoth. It's just that Earvana won on both of my guitars in terms of tuning stability.
AToE, as stated in my post both of my guitars have locking tuners (Sperzels), with less than a turn on each post. Winding was not the problem, although it's a good call.
My idea was not to start a debate!! Just to mention I have been satisfied with my switch from Graphtech to Earvana nuts.