I've just learned all of this information because I recently booked 75 days out. Our cruiser's experiences were all the same. You may book at 12:01 a.m. West coast time.
I live in Kansas, so I had to wait until 2 a.m. The people on the west coast booked at 3 a.m. Get it?
Good luck. It works. Our whole group set our alarms and made ressies in the middle of the night.