Tutorial help needed urgently (Jack's Slack/Star Combo

Hi! I used to do this intermediate trick, Jack’s Slack, all the time. Now, I seem to be having trouble getting the GT to form after doing the brother slackicide motion towards the end. But more importantly, I am also having trouble determining which string is being plucked during this rather epic star combo trick too. I will post the links below. Any POV tutorials or quick advice appreciated.

  1. https://youtu.be/f9Xl_1XucF8?si=Xb5MQP1MGMMonaDk
  2. https://youtu.be/pkYze_i0Vck?si=5qaX6MKLft_q99IP
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