I think 10mm pitch will be plenty good :)
Atleast I hope so as I have it on my machine that I'm building!

Seems like you chose good motors but if speed is important to you they will perform much better with higher voltage psu and drivers. The G540 is a bit outdated I think :)
If you have already bought it its okey because it probably offers good stable motion. But you can get better performance!

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