My tracking was working very well, both .Touch and the headset. No issues at all. Something has changed though... I think after Home updated to 1.6.0.250794
At first I was thinking it may have been hardware issues but the guy I am working beside has 1.5.xxx and he has no problems at all.
Working in Unity 5.3.5p3 I also I have one of my sensors hung on the wall above me looking down at a 55 degree angle and one on the desk as normal.
Questions: Do you have the same Home version as me and are you having any tracking issues? Are you on the same version as me and your tracking with the headset and Touch is working fine?
I don't have touch, so I can't confirm your problem, but is it possible that you need to use a more recent version of Unity in order to work with the 1.6 run-time?