Yes, definately get the wing taken care of, of course more will always surface as soon as you get one taken care of. But atleast your car won't sound superghetto from the outside anymore.
Dynomat? Where in your wing would that go and solve any problems? Weather stripping in the right spots is by FAR the tool for the job, it becomes obvious, just put it wherever there's 2 plastic panels just touching against eachother, which in the spoiler is prettymuch the whole thing. Make sure to get aroudn the LED brakelight thing really well.