My gopros and x3 all split at 4gb. I think it is due to NTSF formatting, and not really the camera. I think FAT will allow larger than 4gb.
I just noticed your is 500megs so that may in-fact be your camera. What file system are you formatting to?
It does not need to be armed when testing the motors in bf while using the sliders. Can you flip the board upside down in bf?
Is there a reason you want to install it upside down?
2217 - 930kv should be plenty of power for a 450mm. I would go lower kv if you do plan on spinning 14 inch props though.
Check ecalc for a ball park estimate.
Did you recalibrate the emu on a level surface when you installed it on the new quad?
Are any imu errors showing up in the assist sw when you connect it?
I am in love with my Taranis, but everyone says that they are a little complicated to setup. There are tons of videos, and sites out there that show how to set it up.