Why is my BMS balance wire melting with custom GT battery?

Hello,

Thanks to all the information on this forum I have succesfully built my own custom battery for Bamboo GT. I used VTC6 cells in a 10s5p config making a 15ah battery. I lengthened the case and stacked the BMS on the VESC to make room.

MY PROBLEM:
It rides great with no voltage sag and double the range...BUT I CANT PUSH THE MOTORS PAST ABOUT 45 AMPS (ie no hills!), when i do the B0 sense wire melts and the board shuts down. The B0 sense/balance wire is the one the goes to the negative end of my first battery pack in parellel. I have replaced the B0 wire a few times now but every time i push the motor hard (up steep hills etc) the same thing happens, the wire melts and the board shuts down.

Any thoughts from the forum on how to fix this melting B0 wire issue? I dont think this makes sense, but is my battery “too powerful” ?

Thanks so much for everyones input, I am also including a few pics of my build for viewing pleasure.

 

Pics of my build. I bought a second battery case and used it to lengthen my case to accommodate the new battery.