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I brought up tire balance because of my M715. It is a closed knuckle D60. Not the same as yours. No stabilizer shock either.
Running ndt tires, I got death wobble 43-47 mph when in a turn. Also 52-55 mph if one front tire hit a bump. I could narrow the speeds it happened, but it still happened...
The open knuckle D60 has a long reputation of liking new or shimmed king pin springs on top. Have you checked or replaced them?
More than likely, your changing the steering stabilizer a few years ago just masked the problem instead of fixing it. This one is probably worn out like the last...