I had the same thing on my switchblade 2010 (i am a newbie but i think it has medium to hard bar pressure, not so light i would say). Tuning the bar solved line slack, put more tension on lines and kite got more responsive.
Explained here:
Don't know about difference in bars (lines) but principle is the same, only thing different is maybe the way they left "more line length" to adjust.
Try yourself, if problem isn't solved, go to the local shop, they can always help. Sometimes doesn't even come from factory fully tuned.