Ah, I see. The mellinger is more sensitive to errors in the position estimate and it is mainly useful with a good mocap system. I do not know a lot about the INDI controller, but I don't think it works without some tweaking.
I think the PID controller is the best option for the flow deck, it is robust and forgiving.
I have not tried a flow deck and the mellinger controller my self, but you can try to switch to the mellinger and see what happens. In worst case you will crash
![:-) :-)](./images/smilies/icon_e_smile.gif)