I never received the xml file to look at any Mach3 settings, so I'm at a dead end on anymore suggestions.
We run R3.43.66 on both of our Mach3 machines without any issues. It's what Calypso Ventures recommends for there screenset that we use. http://www.calypsoventures.com/download ... eases.html
On my servo CNC router, I can raster laser engrave images at a 220 IPM blended feedrate with a .006 Pixel Resolution. But, it uses an US Digital 10bit MA3 analog shaft encoder driven by a 4th axis servo motor to modulate the dual laser diode's power. It's 5W total and It has Gecko G320 servo drives.
Our other Mach3 machine is 2W and 80IPM is max because of it's burning power. It's the stepper machine I have tested our PicConvert with.
This was done on our stepper machine with the PicConvert modulating the laser's power.