Interpreting belt tension graphs

[north swift]

I just upgraded my Vcore 3 to 3.1 and Ratos 2.1 RC3

tensioned the belts to a kina equal tension just by sound and now ran the frequency measure belt tension macro

The first Result I interpreted as lower belt being too loose, increased by half a turn and ran the second test. It barely changed and from the tone the belt makes when manually "stroking" it the lower already sounds higher (so more tension)

Did I get something wrong here?

[crisp meadow]

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[north swift]

Increased the lower belt by another turn and got this