Static test run and taxi test.
As mentioned the manual states 2 CoG. 50mm back from LE and 90mm back.
90mm back is too far. 50mm makes more sense.
The plane will balance at 50mm back with 2-3s 3300 packs but just barely. It could use a little more weight in the nose so 3s 3500's would be perfect up to about 3s 4000's in series.