Good job in the testing. But, the results are a bit baffling. I would have expected the downshift to be smoother with more vacuum.
Now try this:
Go to the Bowden cable adjustment screw which is down below the oil filter housing.
Adjust the cable slightly to provide more slack. Turn the adjuster inward (clockwise, aft looking forward) by two turns.
Take it for a drive and see what happens.
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