The answer is no.
Drivers do more than amplify the signal from the computer. It is them that arrange the pulse patterns to the different segments of the motors.
All Mach 3 does is provide two pulses, one for each step, and one (usually continuous) for direction - per axis. Your drives sort this out to a four wire signal to the motor.
The MaxNC says it can be used with other software (i.e. Mach3), and so it follows the same pattern - two outputs per axis. On my drives there is a switch to change between full, 1/2, 1/4 and 1/8 step for the motors - not in the Mach3 software.
I,m afraid if you want more power, you will have to get bigger motors.