Thanks, Steve!!!
The black Tusq graphite-laden nut I'm using is one that I cut, so there's likely some room for improvement. I used feeler guages to check the string height at each string with a capo between the 2nd and 3rd frets. IIRC, I set my clearance at .012"-.013" on the low (pitch-wise) E string, then went down close to a thousandth per string as I worked down to the high E string. I *think* it's set pretty good.
This is all kinda timely. I ordered a string action ruler last week, and got it today. It's a tool I've been wanting for quite awhile, and I like having it as another reference. They're not expensive; I just kept forgetting to order one, thinking "I got this covered.....". Around the 7th-9th frets, the neck relief is a hair under .01" by this scale. My feeler guages show about the same, .008". This is with the capo on at the first fret, and pressing down the low E string at fret 17 or so. Pretty much the same for the high E string.
The embarassing point is that with the new string height ruler, I got some different measurements than what I posted above. They're actually a bit lower than what I thought they were. With no capo, measuring to the bottom of the string with the ruler at the 12th fret, the low E string is actually 5/64ths, and high E is closer to 3/64ths. Its embarrassing because I'm a retired machinist (from a little aviation company not far from Warmoth......), and I thought I'd gotten better measurements that that with the feeler guage method. Now, we seldom used feeler guages for most checks at Boeing, but still, I should've gotten better measurements before when I set this guitar up half a year ago. The weather has changed a bit since last November, and that'll move a neck around a tad. But basically, I think a combination of very tired eyes, a not-so-great measuring method, and not using my skills had kinda let me down here. Sorry about that..... :tard: