Dear cleeds, ''Your arm sounds defective'' is a curious statement. I am not aware that you listened to my arm. But if you performed tracking ability test and your Triplanar got more than 50 microns ''pure'' I will need to agree that my Triplanar is defective.
What you've described sounds like your arm is defective, although it could also be a setup problem. I don't know why you think that's "curious." Why you should think that the way my pickup arm performs has any relationship to whether your arm is defective or not is quite curious, however.
I don't own a Triplanar, btw. But you should be getting better performance from your arm than what you relate here. It's apparently under warranty - why not take advantage of that??