Wing is warped! I had to glue a trim tab on the outboard wing on mine, to get it to fly level. Look to see if the outboard wing is high or low.
Add more tip weight. Put the leadout wire on the last 2 hole. Make sure the leadouts are a little behind the C.G. Mine was actually ahead.
Video of stock Hyper Viper does some basic manuevers on my web page:
www.aeromaniacs.com