I agree with Kenny. It's amazing how riding in places like Whistler and the North Shore have dictated geometry for places like Florida or Ontario. If I was still riding in Ontario I would look for something with a 73 degree STA so i wouldn't have to drop the post for every descent. Whistler has impossibly steep climbing and I totally get why the Doctahawk was born but it's amazing to me that people who live in relatively flat terrain think it's the best hardtail ever.
In regards to frame size. With steeper STA, longer bikes don't necessarily mean a longer seated position. In fact the ETT on bikes is getting shorter. You may find down sizing to a small will simply squish you up and drop the stack even further.