I personally would go with 4s on an 1800kv motor. If motor rpms are too low, especially on sensorless, startup may be a bit rough. Of course, if using a sensored setup, this isn't a concern.
We will be running sensorless,
Thanks for solidfying my thoughts sir.
Curious about your run times whom run on 4s, what could I roughly expect with 4000mah packs ?
I retired from RC, now life is all about guns and long range shooting.