I've recently put together a quad with DJI FlameWheel 440 frame, ESCs and motors and APM 2.0
I have few problems:
1. in Stabilize mode it's extremely difficult to hold altitude: when I slightly increase the throttle to avoid crashing the copter continues to ascend and even small change causes it to descend and it bounces up and down. I tried changing the controls but they seem to have no effect so if anyone you guide me which ones to pay special attention to, that would be great. (note: in loiter mode it's much more stable).
2. the copter also seems to have problems with holding position despite solid blue GPS light. I managed to put it to stable hover in stabilize mode and then switched it to loiter mode then without touching the sticks observed what's it doing - the copter was drifting to random positions within 15-meters radius - I would expect better from GPS (note: it was open space and no wind at all).
Any help would be very much appreciated