Since you stated it was your 1st flapped stunter, you can expect it to start to turn much quicker and sharper than your previous models. It would be smart to to start out with the line spacing at the handle narrowed down a bit from what you normally use, this will slow the controls down a bit and help smooth the plane out at first. Overcontrolling and larger than planned climbs and dives are common when you 1st fly a really responsive stunt plane.
If you don't have a handle with adjustable line spacing I highly recommend that you get one, there are several people listed in the vendor section of this board that sell handles, both ready to use, and kits that you can assemble and custom fit to your hand.