Had my APM 2.5 on a tricopter. Altitude hold was solid as I-Beams. A large bird attacked my tricopter and the frame was destroyed so I put the APM on a quad now. Flies great in stabilize. In altitude hold, the copter either slowly rises or falls and there is a little bit of random pulsing as it does so. Barometer is covered well by black antistatic foam. Played a little with Throttle Rate P and Alt. Hold P with no real results. Please comment if you have any ideas to what it could be. Thanks!
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Do you have the APM mounted on anti-vibration foam/gel? Alt hold won't work well if you don't.