So an update is in order. I had an opportunity to play around with the wheels and troubleshoot them so more after a ride yesterday. BTW, the noise was definitely present on the ride.

I can recreate the noise, a click or a tick, by tapping rim with my fingertips. I can also recreate the noise by giving giving the wheel (off the bike) a single hard shake. It is definitely coming from the eyelet/nipple area.

The drive side spokes seemed very vertical and tight while the non-drive ones were almost loose. I think the wheelbuilder (if you're following along, is the guy who built these wheels for the previous owner of this bike) tried to counter this by wrapping a thin copper wire around the cross and soldering it on the non drive side only. It looked cool as hell. I'm unconvinced of the efficacy of this particular trick. I removed the wire and and any residual solder.

After that, I put a drop of chain wax in every nipple. Then I loosened all of the spokes one full turn. This didn't really change the trueness of the rim, just gave me a point to start from. I pulled the drive side in a little, then pulled the non drive in to where I "felt" like it should be, then trued, then checked dish and did it again a few times. I ended up tightening the spokes quite a bit more than I had loosened them, IE, the spokes were probably loose.

Initial futzing around with the rim after that seems quiet. It's raining a lot this week and I'm really hoping my wife goes into labor, like now, so I'm not sure I'll give it a test ride too soon. If I do, I'll report back.

I didn't fill my rim with Great Stuff, although I still want to just because I thought of a really cool way to do it.

BTW, while I've got your attention. There is a squeak coming from my seatpost. Lube over every possible surface. It's an older Campy Chorus Ti post with a few dents and no visible cracks. I thought it was my ass>shorts>seat interface. Adding a little beeswax leather conditioner helps a little. If I grab the seatpost while riding, the noise goes away. I think that's ominous, maybe I'll fill that with great stuff too (kidding). I've seen Ti fatigue and crack in surgical implants and ice climbing gear, no reason a seatpost wouldn't. I've always been fond of the way a Thomson adjusts anyway.