If you want to reach heights of 900+ more frequently, here is the technique I use: first, after getting the rotation started, wait until the yeti leans to the left on the ice platform he is standing on. Then, when the angle of the penguin is just right, throw it off to the right at about a 40-45 degree angle. Your timing here is important. If anyone has any more success with this technique or knows something better let me know.