My Thoughts....

Aerobatic models are by there very nature unstable. If the plane was too stable they would not perform all the aerobatics required during flight. You must learn not to pull too much elevator. As the plane slows the amount of elevator needs to be increased but there is a limit. At a given point the elevator throw will cause the wing to stall. The wing no longer produces lift due to the shape of the wing but instead it keeps the airplane flying by its resistance against the oncoming air. The best think to remember is to keep some speed on the wing until you learn how the plane reacts at slow speeds. Adding expo to the elevator can help this immensly. You need a lot less throw on an aerobatic plane to achieve the same results as say a trainer. What you are seeing is a snap. Most aerobatic planes will do this if too much elevator is applied. As the planes get bigger this phenominon deminished.

One other item you may want to address is your prop size. I would run a little bigger prop on a .91 FS. If it is an .91 Surpass II I would run a 15X6 APC Prop. The 14X4 prop you have on there now is a little too small. I run that same prop on my OS .70 Surpass II. If you have a tach or someone at your club does I would recommend checking it. Look for about 10,000 RPM with a 15X6. Any more RPM and you risk damaging your motor.

You can also check the wing incidence by first checking the root then moving the gauge to the tip and they should be the same. This given the idea that the wing does not have washout built into it.

Good Luck, Phil (Mesa, AZ)