In strong tide areas a seemingly good anchorage can be ruined by the tide running in holding the boat at anchor at 90 degrees to the angle of the swell .
My lightweight T24 (high aspect ratio fin and deep, high a/r, rudder) used to roll like a pig and spin round and round, winding the rode around the keel, until the wind got up when it would lie calmly head to wind. Up to and including the point where taking green water over the foredeck. I tried various flopper stopping devices, but nothing was wholly satisfactory. Sheering the anchor and lashing the tiller over seemed to work a bit. Two V'd anchors helped too.
I always found my bilge-keeled Centaur to be fantastically stable for about sixteen hours per day, but it would bob about for a good four hours at a time every now and then. ;0)