Tethered-aligned vs crosswind kites in yo-yo mode

Today I measured the traction of a 1.7 m² sled weighing 0.385 kg, at 6 to 10 m/s wind speed: traction 2 kg to 6 kg. This kite looked to be stable in spite of the low altitude of 5 to 10 m.

Even when holding and releasing 2 m of tether (out of the 10 m), the kite rose a little or a lot depending on the wind speed while he was backing away, whereas when the experiments were performed with a lower wind speed of 3 to 5 m/s, the kite went down when I unwound 0.5 m of tether slowly.

Is this kite suitable for a kite train and in higher scales?