First, you do not need a 58", not for your weight and height. The smaller fin, will not really make the board faster (yes slightly less drag, but not noticeable), it will make the board looser, which translates to a more lively feel in most situations. This of course is very open to interpretation.
Get a surf style board, then you can truly decide if a high end skim is more you or surf style.
Nick
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