Trying to mod a webcam to use with Freetrack is NOT the way to go. Doing it that way is a resource hog and will also not track at near the speed or resolution of an IR camera. Thats why YOU had issues & poor results. It has nothing to do with luck.
Honestly, I find the freetrack software to be more "professional". Far more control over the input settings and ambient IR light level adjustments. Its not a quick out of the box setup, but once setup properly it doesnt need to be touched again.
Its nice being able to just put a hat on & flick a switch and recenter as opposed to having to sit with a flimsy track clip pro with a wire from my head to a USB port and having to wear headphones any time I want to use it. I've used both products extensively and in the end, Freetrack simply wins hands down. The frustration and inconvenience I encountered using trackir is actually what drove me to using Freetrack in the first place.
Freetrack still works fine with the latest DCS, as well as any other 64 bit program once you add the proper files, which can be found online.