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They could indicate me which is the measurement of the correct center of gravity, the measurement indicated in the manual of 145 mm is impossible to reach displacing the battery of 6s 3000 mA recommended by you, in the existing space.
If the measurement of 145 mm is correct, then it is necessary to add additional weight with which the wing load is substantially increased
In my opinion they would have to modify the space for these batteries 6s of greater weight
I await your comments or indications to continue with the adjustment before flying