I'm also having inconsistent acceleration from this just-stock ESC. I had tekin RS w/ same car/motor/battery and everything worked well.

I noticed motor was cogging a little, replaced sensor wire and acceleration got better. But the ESC is not consistent.

I noticed not all the pins on the ESC for the sensor cable are the same length. I counted 2-3 short pins. Is this a manufacturing defect?

Anyone have more ideas to try?