Thanks for all the compliments!
Yes, 5 years is a bit long, but I have completed a bunch of other models in the meantime, including 3 versions of the Sky Sport and the upcoming Sky Streak.
BTW the Jamison weighs in at 35 ounces engine, with an added spinner, and all.
It turns out, according to Eric Rule, that a head gasket is not used on the L&J Fox, but mine probably had the head too loose, and, the plug was a short with no washer. For the time being, I am leaving the gasket in, and may up the nitro to suit. Anyway, compression is where it should be now, and it'll get a workout on Friday.