Not an EMC-guy myself , but what about your drive screws? Pitch (Threads per inch), number of starts, diameter? All "force" the ipm and resolution of your system. Are they set right -- and can they give you 30 ipm? Fewer steps should be faster -- at the penalty of resolution.
Sorry - can't shed more info for you.
:cheers: Jim
Experience is the BEST Teacher. Is that why it usually arrives in a shower of sparks, flash of light, loud bang, a cloud of smoke, AND -- a BILL to pay? You usually get it -- just after you need it.