Quality! Thanks everyone.
You know, it hadn’t occurred to me to move the cleats around a bit. 3mm there and 3mm in washers might make all the difference.
Armstrong, IIRC, was found by his physio to be crooked on the bike, which a small spacer on one side was meant to fix. Presumably the gains outweighed the drag from messing up the Q factor, or he didn’t use it on the time trial bike where Q factor makes more difference.
Thanks for the links – I’ll go buying bigger spacers if I can’t sort it otherwise. It’s annoying because my feet hurt if I don’t uncurl my toes and my knees start to twinge if I do.