I think that 5.5 is too much for any 60A esc, especially a sensorless one. Also the gearing is way high. I'm always being challenged for my gearing being high and I run a 21 pinion for a 5.5 sensored (120A V2.1 ESC) & 23 pinion for a 6.5 in my Lazer.
Try gearing it down to around a 20 pinion and see how it goes but I'd be looking at getting a less aggressive motor too
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