George
Calista is afloat all the time on her mooring – so I cant give a definitive answer.
However I don’t think you will have a problem. When she is sitting in the mud it will be wet mud – so it should not cause the keels to stick. I would leave the keels with a small amount showing in the hope that as the tide rises the keels will emerge from the slots slightly. I would hope that would keep them free.
Trevor