I used a Ardupilot on a small scratch-built foamie of similar size to the Firebird and it flew great. You'll need to adjust some the airframe settings to get it dialed in, the manual covers this. Does yours have the Anti-Crash Technology?
why not read all the posts and build your own using ardupilot???? You will find you have a better understanding of everything to do with the hardware and software if you do it yourself.
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Marc