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Hi Tony,
the essential thing is high enough power supply voltage for higher slew rates... 2 or 3x higher than rated for motors are a good start.
Also, the motors must be appropriate. Low voltage/high current ones will spin faster (because of lower coil inductance).
As far as vibration is concerned, this may be the tricky one.
I solved it by using rubber tubes (from fuel supply) as coupling between motor shaft and worm.
Another place where I had a problem was my spider (it was resonating with PWM frequency, together with the fiber-glass tube). I had to pumper it with absorbing material to dampen the vibrations - I was mistaking them for astigmatism in the beginning :-)
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