Banding does not affect attainable speed only connection speed and as your actual is virtually at attainable there is no banding
is it possible for you to connect to test socket with filter to see if that helps your connection speed. It will also eliminate your master socket front plate as a problem. They do go faulty and just another thing to eliminate. If you connect to test socket then post new stats from router
That has made little difference to connection speed. From your stats the boost has been applied hence why you up speed is no longer capped at 10mb. You can try and get engineer visit and see if they can improve your speed into the estimated range but from dslchecker you are above the handback speed