Different ranges for a certain % of hands.

You should always "tune" you ranges manually imo. From Pokerstove FAQ:
The slider interface for setting the top N% of hands orders the hands according to their preflop all-in equity versus three random hands. This rather arbitrary selection was picked because it balances the value of high cards with the value of drawing cards. It is not an absolute ordering, and depending on the specific situation you may want to edit that range of hands when doing equity calculations.