I just re read your post and you said it allows you to run a smaller main than the stock needle, and just so you know, thats not the case. The NExx and NOZx/N1Ex needles all have very similar fuel supplies towards WOT. Where the NExx needles clean up is in the lower.
Regardless of that, if its working for you thats good. I've never had to deal with altitiude like that before, but I would think the colder temps would balance it out a little too.
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