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You can still increase your stepping rate even further than the 18V rate without over-heating the motors, but you will use more power overall.
Bump the voltage up even further, say 40volts, but use a series resistor to limit the current draw.
For example, if you decide to limit current to 1A, with a 17 Ohm winding you need 17V supply.
For a higher voltage at the same current, say 40v, you will need a 23 Ohm resistor in series with the winding... but it will need to be a pretty chunky resistor(s) to dissipate 23 Watts of heat.
This will increase torque at all step rates, so will also allow you to ramp (accelerate) faster, but most noticable is at the higher step rates.
You may be wondering how this works if the motor still see's 17V at 1A and all the extra power supplied is just being wasted by heating up a resistor?
Trust me, it works.
Let me know if you would like to know why.
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