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There are different schools of thought on this. The longer, lower, slacker school has many advocates. But I know riders who do size down for whippability.
Going to a Cotic demo day and trying different sizes could help. Or even organise one. If you can get enough mates out on your local trails the Cotic moving feast will come to you.
I've got a Bfe with a 1220mm wheelbase and 27.5" wheels (I'm short) and I love it. I wouldn't go bigger currently, think that's as long as I need. All that Geometron and Pole stuff is for the freakishly tall. :-D
I'm in your hands. Not really the type to buy new so very happy to listen to generously given advice and sell on if it doesn't work out. Starting from the common logic sounds like a good move. Thanks for explaining about the proportion of riders and wheel size, interesting how this type of logic doesn't necessarily carry across all genres of cycling so appreciate the heads up!