We're all just anecdotal data points. I pedal 88-94 on the flat, more frequently in the lower end of that, 78 climbing if my gears allow it. Most of the really good LD riders I ride with pedal faster on the flat - closer to 100, though I ride with one great rider who's closer to 60. I'm using 170s on my single and 172.5s on our tandem. I should probably be using 165s and pedaling faster because I've shrunk down to about the OP's height, plus I'm short-legged anyway.

The idea of training at much higher cadences is a good one. I do that and it helps. I also train at much lower cadences, which also helps, just different systems. Homeyba is of course correct, with the understanding that one can train to have a different "natural" cadence than the one we might be born with, which almost all of us have in fact done.

I don't think there's anything to the slow/fast twitch theory as regards cadence.