As Gareth say's just let the moult finish, let the birds rest and then think about how you are planning to race them.
Natural, Roundabout or Widowhood?
If Natural find out the dates of the target races, decide how you want to send the birds, sitting, feeding etc so that you can work out when they need to be paired to be in the right condition.
Also are you planning a series of preperation races prior to the big one or just training from the coast etc?