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 § 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.