First off you are using a digital caliper which are notorius for skipping.
Tighten the friction knob...zero...slide...measure.
I bet you'll get better numbers.
I use analog calipers for all my measurements.
Anyway...as already mentioned you're building to multiple centerlines...you might get a slight variation in where spoke ends end up in the nipples, but not much else.
Also, a reminder that Novatec, no matter how good or high tech they look - they are budget cartridge bearing hubs - a mid range product.
If you want perfection, Phil Wood, Paul, Chris King...etc.
=8-)
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5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life