Deere 290G boom shutter/jitter

Have a 2012 - 290G w 3,500 hours on it. The boom has a shutter/jitter most noticeably when pulling the control back, does it a few times when extending out. It almost seems like the house is loose to the carrier, not a hydraulic issue of sorts, or a bushing is out. All bushings seem good shape. How do you check the house to carrier/slew tolerance? Other thoughts? At times it will jar you out of the seat before you can get it stopped from jerking. Has the 12'4" arm if that matters and...

Deere 290G boom shutter/jitter

Deere 290G boom shutter/jitter