it's not worth getting a headache over the last bit of optimization.

In all honesty if you roughly aim at the 1k EM you might be short a tiny bit or maybe a tiny bit over, but realistically speaking what are the chances that IF you knew the perfect optimum of stats, that you actually hit the sweet spot given how random artifact RNG is?

Don't worry too much about that last 1-3%, unless that is exactly what you love to do, then by all means go ahead. I'm sure there are plenty of online ressources ranging from simulators to damage calculators you could look at.

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Nahida gilded dreams OR deepwood whichever one gives you the better stats.

If Nahida is on deepwood Kokomi is free to use e.g. clam set or even instructor (this is a bit of a waste though).

Personally I would recommend deepwood if you plan on using Nahida in all kinds of teams going forward since she might be the solo dendro unit on some teams where another member holding deepwood makes no sense.