Read power usage and respond when motor is straining
When I was looking in the sensors tab of the LABVIEW EV3 block-based coding software, I saw something that kind of looked like an alternative NXT Brick.



It was actually an Energy Meter, and because of its name, I thought it would suit your needs. However, it's wire port looks like it's intended for Lego Power Functions, but if it's in the EV3 programming software, then obviously there must be some sort of way to get it to work with EV3.