For those who're interested, here the official core reply about my question
I think you mean the lines at 1:30, right?
Those are used only for trimming the bar /making sure that all lines have the same length, as shown in the video. These lines are not meant to be used for kite trimming. If you were to take these lines out, the kite would not perform well anymore.??I would suggest moving the attachment for the steering lines on the kite on the fastest turning speed. The CIT points, I personally leave them on the standard setting all the time, but you might try moving the further to the tips for lighter bar pressure. Then again, you have tried those already.