Sadly no. We changed some things in our Lighthouse Setup and tested the trackers again yesterday.
We still experience a strange offset. At first, we put 4 trackers in a line between the two lighthouses and all trackers were offset towards one lighthouse by about 5cm. Then we moved the trackers around, this also shifted the offsets. Sometimes the offsets are smaller, when you are closer to one basestation.
Because of that, we changed the lighthouses around, changed their modes etc. However, there seems to be no deterministic solution. We feel that the problem is with the Vive Tracker, since the Vive Controller just track perfectly. It is just so strange, since they both use the same underlying technology.
We are very frustrated with the Vive Trackers and propably will be returning all four to HTC.