Here are the tide graphs and astronomical data for San Clemente Island (Wilson Cove) for the four trips dates. If you have trouble reading them, send me a PM and I'll email the full res versions.
7-9 MAY 1.5 day
20-23 MAY 2.5 day
4-6 JUN 1.5 day
11-13 JUN 1.5 day
Note: curves at the bottom are the Maori fishing calendar.