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I've got a fairly new CGEM mount and its a bit spikey when guiding but not as bad as yours. Can't help you much with you problem, but I turned up the 'min movement' a but and its okay now.
Also the binding isn't even throughout a full rotation on my mount. I think its just a problem with the CGEMs. In fact I returned my first mount to Bintel as it was so bad. They said it was a dud and replaced it (good service). The replacement still isn't even but I get OK guiding.
I made do with making it as tight as I could without binding anywhere through a full rotation. And imbalance a bit as casstony says. Thats was easy to do in the DEC axis, but not so easy in RA as that is a bit stiff on my mount.
You mention you found a DIY tune guide. I can't find one anywhere other than adjusting the worm gear meshing. Does the DIY tune you found include instructions for disassembly to clean it all out?
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