[JoeAirPort]

That's what I'm thinking too. I had this plane for three years. It didn't do this. If it's really tail heavy it might baloon on landing but it won't pitch up when you chop the throttle. If it pitches up when you chop throttle add more up thrust. That's how I remember it. The reason is that because the engine is pulling it down when it's rev'ing, and the elevator trim is pulling up to compensate, and keep it straight and level. When you chop the throttle and lose the engine thrust pulling it down, the elevator trim pulls it up.