I think what's interesting is that pahokee is constantly in rural 1A but glades central whose in the same small part of town is in 4A or 3A, shouldn't they both be in 1A rural 

Miami Northwestern

So when will it be determined whose chosen for the top 8?

FHSAA might have to combine rural with 1A just to have enough schools to call it a class.

That is absolutely correct. And to make matters worse, it's supposed to double elimination in the middle rounds. But not for the championship.