Hi Mike,
There has been plenty of prior discussion here about cable sizing. Look for it. And there have been charts posted. You need to size to average, not peak current.
The TTXGP had a bunch of bikes running dual Agnis. Not the one I was with. But those guys appeared to use like AWG#2 to the motors. And they would run hard for a complete charge of 7 to 9 kWh.
Regards,
major