See this post for a handy spreadsheet. The entire thread is worthwhile.
To summarize, start the reservation 10 days before and make sure it goes through your entire stay with the same final night as your regular reservation (btw, your dates in your post are not valid - the final night is before the first night?).
You will be able to make reservations 70 days before your real first night, but only one day at a time. The good news is you don’t have to wake up early - there should be plenty of availability until about 65 days, so you have a few days buffer to make each day’s reservations.