Badger certainly moved around a lot at anchor. However, I think this had everything to do with having no forefoot to speak of and a big mast and sail in the eyes of the boat, and nothing at all to do with the keel. I suggest you ensure that you have a good double roller and set the foredeck up so that your can deploy two anchors easily. We used to do this quite often on
Badger, in windy conditions, and with the two anchors well apart it made a big difference. It was easy to set a second anchor by setting a panel of foresail, pushing the helm over to starboard and letting out extra cable on the main anchor (the second anchor set on the port side of the bow). When we had gone far enough, we'd drop the second anchor (and sail) and then pull back on the main cable until No 2 had plenty of scope.
Alan has Arne-style sails on Zebedee and had no experience of sail making when he built his first suit. He's in quarantine at the moment, so probably has plenty of time on his hands if you want to discuss them with him!