Awesome looking kite, and I really enjoyed looking at the build documentation! I see you added a leech line, you probably already know, but Davide designed it (at least the std as far as I know) without one. My std SS is a bit loud, but I feel that it helps with speed control a bit, especially if you are going to fly figures or compete. You may want to try flying with it loose when you get a chance.
I put a leech line in my UL, though, to get a bit more bottom end out of it.
I added one to my std too. I haven't tightened it yet preferring to see how it flies as planned. So far speed is very consistent, however it gets loud starting around 6 mph. Lots of buzz in the keel more so than the wing tips.