Can't remember if I had ePid errors on my Mach3/IPM setup, but I certainly did see issues when I was running .066. Biggest single issue that I can remember (from a couple of years back) was losing work coordinates and similar things during an M6 tool change. I have a set of macros that I use based on, basically, code I nicked from other sources and combined with the "official" CS-Labs M31 homing instruction (rather than using native Mach3 homing). One is a plain Z height setting off a touch plate, one sets Z height off the touch plate then goes off to measure tool height against a fixed plate set in the bed, and the third just uses the fixed touch plate (for occasions when you have machined away the reference surface, for example). These last two were virtually unusable on .066, and currently I'm running .028 which is much better. It did seem to get a bit confused when I added in my wireless MPG but at least I've found workarounds for those problems.

Can't remember if I tried .062 or just went right back to .028. My recollection is that most of the changes in these last couple of versions were more to do with lathes and (I think, possibly) rigid tapping - nothing that I needed for a router.