1) On this rx the ground pin is on top
2) I have used a white dot code to facilitate inspection of the connections so you don't have to try and trace the wires.
plug the power into TRO
You need BND/DAT to bind with yout TX and to get LOG Data with the Spektrum logger
I also initially tried using an AR8000 with my APM 1.4 and I had endless problems. Once I switched to an OrangeRX 9ch (a Spektrum clone receiver), it worked just fine. You can get them from Hobby King.
How did you go with this connection?
Was it correct on the lowest pins? Did you manage to connect the power in, on a different location to the BND/DAT?
Have you figured this out yet? I have the same setup and would be happy to help if I can, though I'm new to this. Not sure if it makes sense, but I have my power connected to AUX 2.
Inside the 8000 the power connections are commoned across all channels including the Bind/Dat so it doesn't matter where you connect. Getting the telemetry going ... that's a challenge. All the best.