Thanks for the replies.
Thinking about the performance last 3 days (thats how many times she's been out), the oddness of her performance, broad reaching at only 4 or 5 knots, and sails IMHO looking good despite that, and not having the feeling of accelerating down swells etc.. implies it's the hull, there's a sea anchor somewhere.
She's only ever been sailing with the OB down in the well, mainly because I havent mastered the art of hauling it with the sails up. (need to move the tiller aside to do this & that creates havoc.) I prefer not to stow the OB before raising sail, since its all lee shores around here. Yes, it has a 8 1/2" hi thrust prop.
BTW the sails may look over sheeted in the pic, but we tried all kinds of angles and courses. Easing the sheets, the cambered panels backed pretty fast. The boat still remained slightly slower than our old 24' sloop. We preferred 2.5-3.2knots 45˚ to the wind over 2.8-3.5kt at 50˚. Also, telltales on the foresail of a schooner are useless going to windward, can't see them.
Anyway, we've learnt something else new today, & in my rusty mind I think I've read Annie saying this, releasing the sheets stops her in her tracks, and is a window to haul up the OB. Couple of options is to use the plug (for the well) since I have one, and bolt on a trucker mud flap around the OB's cavitation plate.