"I ran into a similar issue when I built my first 3DR quad a couple weeks ago. In my case, the 4 wire ESC control cable from the PDB to the APM had totally different colors than the one referenced in the 3DR instuctions. I had to cross reference the…"

"Hello Nathan,   I would drop down to the 10" props and stay with the 880Kv motors, you have not said how much your take off weight is, however I would not use 12" props unless I'm looking to lift over a 1.2Kg's. I would fit…"

"Hello Nathan,   That sounds very much like the fault one of my customers had on their APM 2 board, and it was a fault on the board and not something he had done to it, I would look to contact the store you bought it from and see if they can…"