Phew, ok, just caught up on several pages of action after being away on hols for 4 days, so sorry that there's been no official response on here from the EDTracker bunch... I think I am the unofficial spokesman
So, to clarify...
I *was* looking into the Opentrack issues but I have to pass on massive thanks to Antmax who, in my absence, has done it all for me, liasing with sthalik (the developer of opentrack) to figure out what the issue was and fix it.
It's clear that the EDTracker code doesn't need to auto-centring aspect when in use with Opentrack, so Rob is now aware and is working on making it a config option in the EDTracker GUI so you can flick it on or off. I think I might also look at changing the auto-centring so that it applies over a longer period of time than it currently does, as it is obviously causing some people issues. Magnetometer integration is something I am looking at too, which fits in the same sort of code area, so I can probably kill two birds with one stone there.
As a short-term fix, I can build a non-centring version of the firmware and put it up on the download site so you can flash it in with the GUI tool and command line tool, for those who are eager to try it out with Opentrack.
Great work guys...

thankyou for making my holiday even more enjoyable by coming back to a resolved issue! Wow, when does that ever happen?!
Cheers,
Dan