with the big stroke of the h23 bottom (95mm I think or bigger) end I wouldn't rev that high. 7000 to 7500rpms is all I would feel safe with. Those bottom ends tend to spin rod bearings when revved higher. Did you have the crank balanced when it was put together, that seems to help a bit.
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Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.