Shipments in the first Age are quick to send, while 2nd and 3rd Age shipments take 40 seconds to send. However Spain gets their shipments faster.
I would suggest to add a small nerf to the shipment speed for first Age shipments, make them as slow as they are for all other civs once you age up with the logistician. This doesn’t nerf the value, but the speed at which the shipments arrive, which is still a small nerf.