I have same situation in 2 Helis, one is Goblin 570 (little nose heavy), another one is Goblin Kraken (balanced).

Situation - heli is hovering upright, tail right, and I make a rainbow away of me with right aileron. At the end of the rainbow, as soon as I stop applying positive pitch, the tail drops down. So the heli is now inverted, tail right, but the tail is pointing down a little bit.

Which parameter can change that? I played with a couple of parameters but with no luck so far.

Please make sure that Geometry 6° value was configured precisely.

In the following page you can see how to configure mechanics precisely:
http://manual.spirit-system.com/index.p ... tive_Pitch

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Spirit System developer