G2 is a great learning tool, I used to learn to hover and do rolling circles. I see you are not interested in 3D but this suggestion may help with other styles as well, go to the Swap Page and download alternate set-ups for the planes you already have. Nothing stock on G2 will flat spin for example but with the tweaked version of some models that are available on the Swap Page you can flat spin nicely.

As for additional advice of how to make it work better try asking in the Flight Simulator Software forum here on RCU.