Brian - Ours definitely looks similar, but I've only had mine for 1-2 years. I've been thinking about these one's a lot and I'm actually going to have Peter Tea over next month where we might do some chopping, but here's what I'm thinking so far.
The Mi-Nishiki (pictured above) - I'm going to let it grow. The base of the trunk is probably 3", but I want a larger tree so I'm going to grow it out for a while.
Hachi Gen #1 - Pictured above and pics 3-5 below, I'm probably going to have to chop it low for the next trunk section. It has a long taper-less section above the bottom branches and the trunk has been partially cut through already from before I got it. Might do that this year.
Hachi Gen #2 - Pictures 1-2 below, I had initially thought of chopping this one really low as well and going with the obvious low leader, but it has nice movement and ok taper going with the primary leader it has now (seen in picture 2 with the tag on it right below the sacrifice stubs).
I need to plant it lower and will probably make it more upright next repotting, but I think this one has the most potential out of the 3.
I've only had these for 1-2 years so far so haven't really done much to them other than repot and let them grow. Hopefully I'll have some interesting progressions to show of them in the next couple years.
-Danny