I have been messing with tuning on the simulator, as well as outside in the air. I have an odd problem that happens on every waypoint exchange: On every echange, the plane, both sim and real, nose down sharply then proceed to regain altitude. Any idea why this happens? The link below is to a screencapture video of the simplane taking off and following a few waypoints. Slightly after 1:00, you can see pretty obviously where the plane changes waypoint and noses down hard. Note that this behavior exist on my plane using a 2.5+ APM board on ArduPlane 2.70, and while it's not as dramatic, it is still prevalent. Any help appreciated, thanks!