dji quad apm diydrone

Hi everyone. I am having a hell of a time. So I've build 2x DJI 450 and one DJI 550. Sometimes with GPS sometimes not. All successful builds with flights. I thought I'd try some other systems out there. I have the KK2 on order but I also picked up the $200 arudpilot 2.6 from DIYDrones.com...