I’ve tried 35 or 37 or something like that way back. Man we tried everything back then. Stacked kites!!
Think guys are racing with that kind of length these days. Your going to feel the decrease in response, but the kite still flies well even if a bit spongy. The power stroke is massive so you definitely buy some low end and it can get a kite up into more wind when there sometimes isn’t much on the surface. As long as your ready to deal with the less than ideal relaunches of really light or flukey conditions, I recommend you give it a try. Think a few of the low wind kites on the market ship with standard lines in the 27-30m range. Longer than that is an effort to eek out the very last bit of power, so you can find yourself able to ride in conditions that will sometimes leave you swimming. If you have the patience to wait for that extra two knots your going to be powered with that kite on regular lines anyway. Give it a try on a day that is workable on normal lines and see if you like it. The jumps are pretty weird. Not any higher really as its usually not much wind, but the slow long airtime is pretty novel. Everything is kinda in slow motion and your planning all your airs or transitions well in advance.
I’m far too spoiled by instant response to wanna go back to it, but I reserve the right to change that opinion in the face of a serious wind drought!