Can you make a static test? Tie tail to large spring scale/load cell,
run it up and observe result...

[This is inspired by my memory of a drag test on the Gossamer Condor;
they used a spring scale in the tow line...]

Then at least you can examine variable without test flights.
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Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433