Nice Ride out!,
I would look at your positioning of the Camera though, id say its chest mounted, Very difficult to see anything and in the terrible event of an incident you can't see what's ahead on the road with the footage.
I have mind mounted here its detachable.
1) no it is not heavy you don't even feel a difference
2) it is not in your view point at all
3) you can talk into the mic at the back if you have the open back door and its clear and audible
4) It captures everything you are looking at the whole road and your perspective.