I've been running an 8.5 X12 + SXX Esc indoors (Formby/Bury) on my B4 and the motor runs pretty cool (circa 115 deg F after 5 mins). I can't comment on the Sphere, but before buying the SXX I ran the X12 with an Excelorin Esc and the motor temps were very similar. As it is only an 8.5 rather than 5.5/6.5 I should imagine that it would run cool with any good Esc.
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