note Big boats are in but the 8.6 is a monster for someone your size...
One of the problems with being too small for a planing hulled boat is engaging the chines in a turn, like catching eddies and pealing out.. Small people tend to flat spin across eddy lines in big boats.

I think it's less of a problem in displacement hulled boats like the Nomad.

You should try to hook up with a local club or something and try different boats. Even in a pool. Just racing from one end of the pool to the other and seeing how the different boats turn would probably be enlightening.
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HaddenL