[Arbo]

There is a setting for pulse width in the Mach3 software that has a wider pulse width option. Try changing it, saving it, then restart Mach3. See if that works. Use some blue thread locker on the set screw if you haven't done that already.

I didn't find that, but I noticed in motor tuning that x and a were slightly different. Fixed that but didn't make a difference.

I had same problem missing steps, and all started when using 1/16 ballnose with large a stepover. I fixed by shutting toolpath display off in Mach3. Easy test, maybe worth a try.

with a large stepover? that seems strange... how do you shut the toolpath display off?