Check out www.customflhtwindshields.net Makes a world of difference in the airflow over the speakers. I'm running the stock HK and 7.25 J&Ms and can drown the pipes out at any speed.
The earplugs are actually a fairly difficult install - I can't seem to find in my owner's manual how to tell which one is for the right ear and which for the left ear!
I have the AVC set a level 3 (3 bars showing). I was looking into the idea of a new windshield. I am currently riding with an 11" HD winshield. I'm 5'10" and almost always riding 2 up. Stock HD touring seat.