I have found that around 18 kgs - at the dovetail - is a good limit for the EQ6.
Mine rides very smoothly with an 8" Mak (11kgs) an 80mm guidscope (around 3kgs) and camera gubbinses (another 4kgs ish).
Getting the balance right has a profound effect on how well the mount performs.
I try and balance mine over four "points" on the extremes of the axes.
This is a little fiddly but sems to pay dividends in performance.
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