While it is mere gut feeling, I have never liked the three screws into the front and rear cell method of connecting the rail to the OTA, just doesn't seem right. Rings would be my preference.
Maybe you could also try by-passing the dovetail and saddle idea altogether. It seems you are semi-permenant, and perhaps you could bolt the lower rail directly to the top of the mount head (where the current saddle attaches). The EM200 allows this, with the Tak clamshell fitting directly, with two allen bolts.
This may remove any wobble from where the rail fits within the saddle, and if nothing else will get your weight closer to the pivot, albeit only slightly.
I don't think steel as a rail is any better to be honest.
Dennis (as usual) is right, you normally get what you pay for with a mount, and this ultimately could be the next remedy, upgrade. Try to work the current system first though.
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