I never let my Gold Nugget or Sumo hang longer than March, otherwise the fruits are over ripe.
So, I don't seem to have the problem of alternate bearing on my Gold Nugget, Sumo, Ponkan, and the rest of the mandarins I grow (Tango, Honey murcott, FL murcott, wekiwa, etc). My Valencia orange may be the only citrus that ripens later in March, April.
I don't have any mandarin that needs to hang until June to be ripe.