Hi Varratt .
The 109 tends to stall quickly and easily. The wing doesn't have the lift of a Spit. You must learn to be gentle with the controls. The best thing to do is to turn down the sensitivity on your joystick settings. Also try cutting back on the throttle as prop torque tends to push you into a stall. Like wise applying some throttle can twist the plane out of a stall. If you are low on speed at the top of a zoom use lots of rudder and let the planes nose drop down and pick up speed by it's self. Any sudden moves of the controls at low speed and a wing will drop.
Main thing is to practice practice practise.
Having said that I still stall when I get over excited on line, I tell myself to calm down and breath. Don't try to match his turn.