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VC4 500mm Hybrid Belt Tensioning Trouble Shooting

Having some trouble getting a good clean input shaper now with the Hybrid Y installed. I'll start from the beginning:

First three photos are belt tension and the X and Y Axis input shaper. All three look good. CoreXY Y Axis MZV is 3,400.

Fourth photo shows the initial hybrid setup giving me two peaks. At this point, I was getting lots of 2 and 3 hump EI recommendations (not great).

Fifth photo - I loosened the hybrid belts from 4th photo, which improved the look of the graph and gave me more MZV recommendations, but resulted in significantly lower input shaper recommended values. This pattern continued until the hybrid belts were so loose that I regained my stock CoreXY profile.

From the fifth photo, I tightened, and got a photo similar to the fourth photo with minimal adjustment. Last last night, I took apart the hybrid system and ensure everything was built correctly.

Sixth photo was after rebuilding the hybrid system and running super, super, super low tension (barely attached). Unsurprisingly, graph has very low recommended acceleration.

Seventh photo - Tightened from #6 and observed the same pattern - eventually two peaks form again. I tried loosening from here, only to see the same pattern - higher frequency peak disappears but get a very meager improvement in recommended acceleration.

Since things weren't working like, decided to even tighter. Eighth photo shows me going tighter. I get two very distinct peaks at that point.

9th photo is even more tension - two peaks start to equalize but I feel like I am really, really at a high tension

10th photo: continued to increase tension. First peak is reducing, but still present.

That's more or less where I sit right now. I feel like the Y hybrid motors are super high tension. Reducing tension from here results in two peaks returning.