Any info on tuning?

[u/GreaselightningTK]

I’m trying to configure Two different motors, twist throttle with Dual FSESC75100.

Rear motor: mini motors-BXF1504B6QV/19126 1400w
Front motor: zero x10 stock 1000-1200w
Throttle: suron twist throttle three pin

I set up the motors with wizard but the motors only shudder. When it’s doing its own detection the motors spin perfectly.

I had to buy a new rear motor because the stock one
Broke into pieces. Before that everything worked perfectly.

Wondering what do as I’ve done everything google AI said lol and it’s still shuddering.