I think I figured this one out through repeated frustrationand "try, try again" approach.
It seems the fundamental issue I had here was that I had attempted to make for a "simpler" simulation by complicating the parts.
By that I mean that the coaxial tube setup was created as one single part rather than 2 coils to be placed independantly into an assembly and mated.
Well now it runs just fine.
Although I am still getting fairly long CPU time I am getting full 100% progress and acheived goals without any of the mach or vortex errors.