My tower will move side to side a bit if you push on it, been like that from day one. To be safe, I'd check the mounts from the inside of your hull and see if they are tight. Maybe have a friend push the tower around a little and check for excessive movement. As for the tower itself, check all of the bolts, locktite as needed, and that's about all you can do.
We hang like drunken apes and sit on top of my tower sometimes...it moves a little, always has. Hope that helps.