i looked at heron and lady elliot.
you're right.
never really gets that strong but has SE - ESE winds. best time seems to be cyclone season and i'm not going there in cyclone season.

from the bom data it seems most days it blows 15-20 knots but never really gets over 20. (a kiters paradise)
http://www.bom.gov.au/climate/dwo/200803/html/IDCJDW4071.200803.shtmlgreen island on the other hand. pumps........