You want to look at swell rather then wave. Swell is larger ocean effect. Waves are the more acute wind influenced effect. Waves are more wind based and aren’t really bothersome at most anchorages. Swell can be very bothersome when is rocking your boat all around.
In a big north swell avoid Honeymoon, Caneel, etc on St John. Maho and Francis are good. In south swell avoid most southern anchorages. Everything feels worse on a mono vs cat.
Instead of windguru, check windy.com
(Just my opinions and observations)
In a big north swell Honeymoon and Caneel would be a better anchorage than all the bays from Hawksnest to Francis Bay.
Water lemon Cay on the east side will be calm along with all the anchorages on the south shore.
