Do one of two things ,either shorten the removable bridal line by tying a figure 8 knot further up the line or make up two longer pigtails to replace the ones at the ends of your steering lines ,mine are 200mm long with three knots i run my other kites on the bottom knot,std length and the 6.5 on the top knot(lengthens the back lines by approx amount of depower.
For some reason they run at a different length than the bigger kites.
Youll love the 6.5 had mine out in 45 knot so far it rocks.
Can post a pic if you need one easy mod.