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Well, the geometry on a mountain bike is really different than a road bike, but that's a hint you might need to lower it. Did you get a real fitting from a bike shop? Not just a cursory measurement...

I can't add anything different, except that I cannot overestimate how important the tilt of the saddle is, even in increments of 1 cm. I need mine to be slightly tilted up.
I switched from a Terry...