Yes, I do believe the vents increase the wind range although I think the placement on the ultra keeps the wing tips from rattling in the higher winds. I don't think they affect doing quad stuff. I am surprised how well it handles the higher winds since it's not a very heavy kite, but it will still hang in there in a lighter wind. Thanks again:) Please feel free to ask as many questions as you wish:).
In fact, they DO affect the quad performance, they make a reverse flight a little smoother.