there is no such thing as a particular kite turning faster or slower. a kites flying speed doesn't change. just saying.
maybe it is more or less sensitive to steering input (how much the bar has to angle to effect the kite), maybe it takes more or less force to effect the steering (usually by adjusting outside line attachment point) maybe it turns in a tighter or wider radius (usually by adjusting bridle attachment points and the closest thing to "faster or slower" in terms of turning), but speed is speed not a steering characteristic. speed is how fast the kite moves forward (which could be a straight line or a circle or whatever).
that's right. im saying EVERYBODY is describing how their kite flies wrong. your all wrong. not sorry about hijacking this thread.
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OP: 50cm on everything if you want to keep it simple. one universal bar, lots of kites.