LOL, thanks Mike!
Bear in mind I continue my progression and study of Japanese tools, so I am not an authority, just proceeding with enthusiasm. I decided to get a 375g as well because 675g this is a heavy weight to swing for all tasks.
The combination of metal hammer with a soft center and hardened ends combined with hooped handle has a dead-blow effect. It's that effect that really drives the chisel. I decided on red oak handles for the mortise chisels for that same reason.
Ebony would not deaden the blow as much as red oak, and so for my small carving chores I decided on ebony handles and a small hammer, it should result in an untempered transfer of the hammer blow.
I preferred this to the bouncing of wooden mallets, though I'm sure some may prefer them for that same reason.