Sorry Wesley, but the tides on those dates are no good for the island!

The waters too low to sail on the reef flats so you will be sailing in the messy mid tide chop and swell with no safety net, as you will have to sail down wind of the island most of the time you are here.
Unless your staying on the island, then you will be able to sail before 10 in the mornings and after 3 in the arvos.
At least it will be warm!
Good Luck!