Mooring depth and waves

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Thanks everyone for your replies.

The mooring is going to be installed just north of Lahaina near the boat ramp. So there are lots of other moorings there.

I am having two manta-ray anchors installed which will connect via chain to a mooring ball. The manta-ray anchors are driven into the bottom and spread open, and the chain is held up by the buoy mid-depth to keep it from touching the bottom area. This is apparently the new system that will be used from now on. I needed two because I have an old heavy boat (26,000 lbs), and a single anchor would have a short safety margin.

I just wanted to get an idea of when I needed to move the boat out of there.

I spent a month moored off the Lahaina coast in August last year. Was a great time. When the waves did get a little rolly I uses a bucket tied to my spinnaker pole, and pointed out the side of the boat. Slowed the rolling a lot. (Home depot buckets are strong!)

Here is the mooring design I had drawn up: