Alt Hold help...

Hi all, 

First post, be gentle :)

I have a q450 (Flamewheel) running an APM 2.7.2 Micro and I'm having trouble with Alt Hold mode. 

The quad won't stay at a given alt. It will 'bounce' around the place, sometimes coming down to ground level and other times lifting off an just going up and up. 

I've checked my vibration levels which look fine (between +3 and -3) and I've put foam over the APM to protect the barometer from prop-wash. 

I have flashed the APM to 3.2.1 and reset all PIDs to factory defaults. No change. 

Can anyone suggest what else I can be looking at?

I've attached a log if anyone has the time to take a look...

2015-04-27 21-46-50 19.bin.log

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