Hello all,
Tangential, but gennou have a relatively soft core smithed onto hardened faces. The result is a more solid feel and noticeably less bounce than a hammer with a solid head. While my Hiroki is one of my favorite tools, I suspect that any laminated gennou such as those sold by TFWW would work similarly. I have not had a chance to try a damura.
Vince, that's a nice pair! Here is the pair I use, handled based on Stan's excellent set of posts. (240 g Hiroki and 375 g Tsuchime).
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"You can observe a lot just by watching."
--Yogi Berra