Hi there!!
I have the Aura so I can help you out
The first thing you should do is adjust the height of the head. The head itself can be raised and lowered via the bolt up in front. You want to make sure that the tension is loose on the black drive band when the tension knob is set to no tension not so loose that it's going to fly off and when the tension knob is screwed in all the way the tension is tight. Currently you have a pretty light tension on the knob but the over all tension of the band is pretty snug. It should cooperate a lot better once you get the head lowered to reduce some of that extra tension.
As for testing your test you don't need to pull it off the bobbin. Usually there is at least a foot of spun single between me and the wheel and this can be let to twist on itself to see what your twist is like.
Please feel free to poke me any time for help on your Aura. I adore mine it's such a great wheel.