Have you watched this tutorial?
The two important things from this tutorial are:
1. The new "neutral position" of the cyclic when hovering
2. Only small adjustments to hover above one place
One thing that might help is the Saturation Y slider for the pitch and roll input, you can find it in controls->axis->axis tune. But be aware that when you set it to 50%, you can move the stick all the way into one direction but in game it will translate to only half the input so you probably need to trim a lot.
With the warthog stick i had it set to 80%.