I would just try moving the CT to a non-generated leg.
A VFD might be more trouble than it's worth. You would have to find a place to mount it, re-route the power conductors, connect the controls and program the vfd. Then, it's bad to quickly switch the power off and on to a vfd so it adds another complexity to turning off the machine and turning it back on.
You would have to warranty the vfd for a period of time and, if it failed, provide a replacement while the manufacturer decided whether they would pay for the new one - which they probably wouldn't. I love the way vfds handle a motor but I hate dealing with a vfd failure.
