Coming from Discover 150S, I had the same issue with my Dominar (got a month ago). Gears in dominar are a bit tall, and engine prefers to be in 3000-4000RPM band. I started upshifting at 4000RPM and it never stalled since. For first gear, you need to twist throttle a little bit more to keep it from stalling (I had to deal with this because Discover gears are fairly short comparatively).
When you engage the clutch, you are also turning the input shaft in transmission alongwith the output shaft of engine (even when in neutral), whereas when clutch is did-engaged, input shaft in transmission does not turn. This is the reason of difference in sound, and it is pretty normal.
Enjoy your new bike


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