When flying a model such as a raptor in RealFlight G3.5, should I be able to hold the heli absolutely stationary? Even with no wind it seems like the heli is constantly moving around in an area around 5-10 feet across.

Try low rates (the two postion switch above the throttle) and make sure the cylic trim levers are centered.

But flying a helo is like balancing a beach ball on your finger, you constantly have to fly it.

The new 3.5 is a bit harder than I remember also the Dominion is a pain to hover well.