So I have tried testing the drive of the robot, I have 4 15v drill motors powered with a 4s 4000mAh 60c lipo.

To at least get the robot running I tried two hobbywing 60A esc's. It didn't work... The speed controllers couldnt get the wheels moving and they seemed to really struggle. I think I may have even blown one now as well. I know the problem is not with the motors or battery as directly connecting the two causes it to jerk quickly to life.

I'm thinking I'm going to need something far more robust to get this thing going. I heard the tz85 controllers are good but discontinued. The replacement bb80 controllers seem good as well but are out of stock. I would need to use two feathertwo controllers but again these are out of stock.

Seems finding a good featherweight ESC is like gold dust

Anybody have any suggestions?