This is full ring right?
-yes you can steal from him a lot, but when hes opening such a tight range his fold to pf 3b stats are prolly really scewed so I dont think you should start 3betting him that light yet.
-Not really sure what you mean by he varies his preflop actions.
-It should be easy to put him on a range because it's so small.
-I think that you should be analyzing a better(?) reg