hi have been trying over a year to solve the jello from my m600pro with ronin mx - can dji assist?

Have you considered opening a ticket with DJI Support? Can be done here: dji.com/support. They should be able to help assist you with your problems.

When shooting in 30fps or 24fps, please try to keep your shutter speeds to just double your frame rate to avoid the jello effect. For 30fps, the shutter should be 1/48, or 1/50 if 1/48 is not available on your DSLR. Cinema cameras should use a shutter angle of 180 degrees.
Please let us know if it helps. If not, any chance to share us a short video? Thank you.