Motor upgrade questions

After watching he motor upgrade video I am looking to upgrade myself and had a couple of questions.

Is there a noticeable power increase from the stock 2hp motor to the 2hp Black Max inverter duty motor?

Through my work i have access to a wide range of motors for very cheap or even free. Would there be any even better motor choices that would fit the mill if you had the option to choose what you wanted to install?

The BlackMax motor definitely has higher torque at lower RPM than the stock motor. I also upgraded the VFD, so it is likely that I am also gaining some benefits there.

To maximize torque/power output for a given size motor, then an AC servos is your best bet. Generally, the cost of the motor + drive would be the main downside, but the BlackMax motor I used has increased in cost by 50% since that video…