I like my 2011 on 23m lines more and that's what I use, but I am more into unhooked. For jumping I prefer shorter lines, as I find it easier to hold me edge while sending the kite.
For jumpig I'm totally agree with you..but why do you prefer "longer" lines for unooked???more slack???more range???
But how come for jumping, you prefer the longer lines? Probably it´s just me, because i´m really used having 23m lines, and the 20 m set, really doesn´t feel right...