I had a play with the hyd system in the excavator.
I pulled all the servos off the valves and centred them.
man I wish I had done this years ago, so much better and easier to control,
next on the list is to sort the slew motor, I have wear in the shaft and gear causing the wobbles when you stop the movement.
heres a quick video of the before and after
https://youtu.be/bLsvjFPvOsI