Unwanted roll after pitch back to centre

I have a Q450 frame with MT2213-935KV motors and 8" props running APM 3.1.5

I'm having trouble tuning the thing and I was looking for some advice. I've been through the standard APM tuning guide, and for the most part the quad is flying pretty well. 

I

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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 ti

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