Don't draw any conclusions until you've put more hours on the cartridge.
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When you say that "the balance is lost", are you referring to channel balance, i.e., are you saying that the signal output from each channel is unstable? I ask because azimuth per se has little effect on channel balance. Azimuth affects crosstalk, not channel imbalance. If output amplitude is wandering, I would be concerned about a defect in the cartridge.
By 'the balance is lost' I mean one side is typically clearer and slightly higher amplitude than the other, and it depends upon on a few degrees of change in the azimuth. It can be either the left or right, with one or the other sounding nearly perfect and the other just slightly off. The central voice is also typically slightly off. It just so happens that today I seem to have found the perfect spot, and it is 'dead on', voice is centered, instruments are appropriately spaced and span completely from left to right. Everything is as perfect as I've heard it. I just hope it stays this way. I managed to achieve this by using the High Fi News and Record Review Test Record's mono cancellation method as a first approximation and then fine-tuning it by ear.
i have a triplanar also, I found it took me a few weeks to nail it by ear, i haven't touched it in over a year...I do use the vta often with every change from 150g, to 180g to 200g....I can hear that...
also do you use your damping trough on your triplanar? if no, take it off, 2 screws, 3 minutes. listen before and after... (hint)