You can try to increase the sensitivity of these keys with the Aquasuite software and see if this helps. Just go to 'User Interface' -> 'Key Settings' and scroll to the bottom where 'Key sensitivities' is and enter higher values for those buttons.
So increasing the values of the buttons that don't work to 30 got them working. The top two that were working to begin with are still at 5. Does this seem right? Why such a difference?