I also ran 17/78 on a small, high grip track. But I have to say the Sphere/3* combo becomes quite brutish then. The "smooth" setting of the Sphere is to soft on a high grip track so I compensated with exponential on the transmitter and the slipper clutch.
I have the new Sphere Competition now and that ESC has 6 powercurve settings instead of two (not considering the rather useless "sportman" setting).
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