Districts, subdivisions of districts, and the distribution of representation among growers and handlers within a respective district or subdivision thereof, or among the subdivision of districts, may be reestablished by the Secretary, subject to the provisions of Sec. 930.23, based upon recommendations by the Board. In recommending any such changes, the Board shall consider:
(a) The relative importance of producing areas;
(b) Relative production;
(c) The geographic locations of producing areas as they would affect the efficiency of administration of this part;
(d) Shifts in cherry production within the districts and the production area;
(e) Changes in the proportion and role of growers and handlers within the districts; and
(f) Other relevant factors.