I have found open track to work very well. I am using a head tracking system from a guy called Grassmonkey Simulations. https://grassmonkeysimulations.com/
He 3D prints them, and they work extremely well, an they are wireless, which I really like. I never did like Trackir 5 with the 3 pronged hat clip. I know they are held in high regard, not bashing them at all, I just prefer this wireless solution (at less than half the cost). I am using a profile for IL-2 BOS, and it works just fine.
He has 100% reviews on Ebay. https://www.ebay.ca/usr/grassmonkeysimulations?_trksid=p2047675.m3561.l2559
I hope I am not breaking any rules mentioning this guy.