I was flying my Barresi Signature Series 1.5 Rev. In the past I used to tighten the brake lines rather than lengthen the top lines.
Having watched the video, I added 13" graphite handles and added My home made top leaders ( Toal length 6" knotted 1" gaps.
Wind was 1to 3 mph. On 12'' handles with equal leaders the kite took off OK and was manouvrable.
On changing Handles to 13" and using full extension top leaders it was immediately noticeable that there was more control,
and I was able to use the handles in the More horizontal attitude rather than the upright hold. I definitely recommend that top leaders are used. I will need to practice this in future.
I suffer from some arthritis in my hands and fingers so was sceptical that balancing on the fingers would work. I was pleasantly surprised and with more practice perhaps a step up to ???