Adjust the bridle string. Refer to diagram 5 . Just as important as equal length flying lines, both clips must be evenly positioned on the bridle. Very uneven clip positions will result in an uncontrollable flight. The manufacturers factory position is almost always marked on the string.
Slight adjustments can dramatically change the performance.
To ensure even clip position, pull the clips straight down towards the bottom spreader and see if both clips are equal distances from that spar. Once you've done that, pick the kite up by the clips. The center spine should hang roughly parallel with the ground. Some manufacturers have stopped using metal clips on the bridle. They have replaced it with a short piece of line for attaching your fly line to the bridle.