D6 9U Clutch adjustment issues

I'm not familiar with the design of the D6 clutch, but I have experienced the same thing with the dry clutch on the D8. The solution is usually to lubricate the face and pins of the cams that actually do the SNAP over centre. Oil around the area I've marked with a red dot is usually effective in my experience. 

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If the pins, linkages are worn, it will be hard to get a good adjustment on it. If you find that these are worn, you'd be well advised to replace them so you can adjust to good operation for both engagement, disengagement, and clutch braking. My D2 wasn't able to be properly adjusted until I replaced all the pins and bushings. After that, it was a cinch and it stayed adjusted too

I should have said that my issues weren't due to excessive wear, but because the machines had sat unused outside for lengthy amounts of time. Some lubrication and use rectified the problem for me, without actually making any adjustment.