Which way is the motion? Side to side should be looked at, as mentioned above. Fore and aft might be remedied by either pinning the keel down or winch tension depending on your set-up. I disagree with halekai on raising it unless for a compelling reason-you're raising your ballast and you'll also have a boat that is far more prone to veering all over on her mooring.
I'm not familiar with the Hunter and so cannot speak to that boat specifically.
“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.