Just for kicks, I swapped out the NBZT's & reinstalled the N3RF's, & with the only other change involving the pilot screws at approx. 1/4 turn less out (& with the modded "46.5" pilot jets still in), the highway cruise AFR was up, to just over 14 AFR (motor not yet fully warmed up), which is about where I want it. Temps in the low 60's, low humidity, gusting winds.
This confirms for me that all other things equal, NBZT needs a smaller pilot jet as compared to N3RF. And I would tune to optimize the pilot screws, however I really like the NBZT's a bit better, so 45 pilot jets & NBZT's it will be.
If I need to go to a slightly smaller pilot jet, at least I know what to do.
I also ordered a higher-quality pin vice if I ever need to drill another set of pilot jets, to make, say, a "43".
