Dude the 100a motor rating is the max it can take, i dont think you will have any issues with a smaller esc, just wont be able to push the motor to its limits… which is probably a good thing.
I may be totally wrong here, but I would think that the motor isn’t gonna take any more than the esc can deliver.
You would have to be going pretty hard to be using more than 50a continuous to each motor.
The makerx escs have a pretty good range and although they havent been heavily tested by the community I think they are doing pretty well so far… lemme get you a link…