I'll try to get you those files as soon as I can.
I did do some more testing, and turning the frequency down to 4 helps. I actually thought I;d solved the issue since it seemed to be working great at that slightly lower setting, but it eventually stopped following the path I laid out.
So it might have something to do with how the frequency of movement works since 5 glitches out almost right away and 4 works for quite a while (over 20 moves) before glitching out totally.
I've also gone back and forth between two different versions of mv3d: 8.3.1 and 9.0, but they both have the same issues. I'm using 8.3.1 in my project, by the way.