Thanks all for the your input and replies. I re-spaced and re-dished the rear wheel last weekend. I used thread locker blue and put my 200 lbs into the chain whip to snug up the cog. 60 miles so far and no mechanical issues. In the spirit of "didn't happen without a photo," I attach two from my afternoon ride (taken just before the 40 minute delay for a downpour, thunder, and lighting). I've enjoyed my first fixed-gear rides and like the variety it has added to my mileage this week. The rear brake is redundant, but I didn't want to have to re-wrap and shellac the bars if this ride evolves; and it provides some security for my novice fixed-gear skills (descending on dirt roads is gonna take a bit more practice). Cheers.
drive-side profile


wheel-dish and chainline