Good stuff my man, a few tips.
Your set,
Use your arms to set high. You are throwing very low, very common when learning the bf.
Swing your arms high, swing by your ears as you jump up, not back, then you will know you are using full motion of your arms.
What you are doing now is more like a whip back, again, not bad, just the norm when learning. if you came to the next jam I can definitely help you out.
The spotter,
You are not spotting the shirt to stay on, place your hand on the back, flat, and push up is needed to keep center of gravity high. Let go of the shirt.
Keep it up though.