Hi,
your existing D57CM31's are great 23 size steppers with class leading inductance of only 1.1.8mH

Quite frankly I think you've already got the best possible steppers you can. Run them at as higher voltage driver you can get, the practical
maximum at this time is 80VDC, with a linear 80VDC power supply.

If you want more performance than that get AC servos like Delta's or DMM's and be done with it.

Craig