Alan...
Running up LI Sound towards BI gives plenty of seaway between The Race and Plum Gut. It may not be a perfectly straight course, but my point was to avoid both locations by riding the proper tide eastbound right up the center of LI Sound. Once clear of The Race (North) and Plum Gut/Plum Island/Gull Island (South), then adjust your course to BI New Harbor.

How's that sound, OK?Watch Hill Passage is OK, too, but will add miles to the trip unless a stay is intended in Mystic, Stonington or Watch Hill.