Shaper graphs have different peaks for Y and Z

I just reworked my whole X-axis on my V-Core-3.1, 400mm. Based on the belt graphs, I think the tension is about right-- both peaks are close in magnitude on 55 Hz (can I tell if they are tight enough from the frequency? or only if they are equally tight?)

For input shaping, the Y-graph weirds me out a little bit. The Y and Z have different peaks, and Z is actually quite a bit taller than the Y vibration. As I type this out, I realize that must mean the whole tool-head has rotational vibration around X axis as it vibrates at 43 Hz? I presume that is not normal? If it's fine, which frequency should I use for input shaper?

If it matters, I'm using the toro3d tube and rail that I won in a Discord raffle forever ago. It is 340g lighter than using regular rail w/ 2020 aluminum.
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