I would think, on the 537, to start with either a 19 or 20 with the stock 96 tooth spur, then after a 5 min run, check the esc temp, with the onboard temperature indicator, if you are on 5-6 lights, then don't gear up any more, if you are running pretty cool, and in need of a little more top end, gear up another tooth on the pinion.
R1 setting
Timming - 80
TP - 3
limiter - 90
neutral width - 10-15
brake strength - 100
drag brake - 10
That should have the esc powering the motor correctly, then it is a matter of working out gear ratio.
Hope that helps
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