The turn radius can be a significant element in order to optimize the power to space use ratio.
The turn radius (or the radius of a turn) is the horizontal distance required for an aircraft to turn. It varies according to the bank angle and the square of the true airspeed.
To extrapolate by simplifying, the heavier a kite is for the same wing loading, the faster it must fly to ensure its lift and maximize its performance.
As an example, a very efficient rigid wing with a high wing loading will fly quickly so as not to fall and maximize its efficiency. As a result, its turn radius will increase considerably (to the square of the airspeed). So the power to kite area ratio will be maximized, unlike the power to space use ratio.