I had a chance to try something similar to your amidi
I use SendSX for a midi utility app.
I took the exact code I posted up in my original posts from my controllers and the HAWK responded!
I could see the LED display show the parameter change.
I think it was jumping values though, not showing a steady and smooth change with many values.
THEN, I tried out the msgs sent from FL Studio's MIDI OUT plugin and it seemed to respond better, but still jumped values and would not show a smooth flow of change with many values.
How very odd! It wont respond to the msgs sent by the controllers, but it will respond to the msgs they send out if I send them again in a midi utility app like SendSX.
Hope that gives a clue about what is happening...
The msgs I posted is all there was to capture from the controllers.. there were no other mixed in data msgs.