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May be that 10 is correct.
More small are the heli more little the tail gain must set.
In fact, you can see that in the instructions of microBrain, that is used on small heli, the starting point suggested for tail gain at page 5 of the wizard is 20 instead of the 45 suggested for the bigger Brain unit used on bigger heli
Also, more high is the mechanical gain (like in CFX180) more little must be the tail gain.
So, 10 can be correct.
But I also have heard about mechanical tail problem on some CFX180 where the tail case move on the tail boom and consequently is needed a lower gain due to the tail case oscillation / vibration / movements. Have you checked our tail case is correctly fixed on the tail boom?