I had exactly the same issue when I recently purchased my EQ6. I was told that I should simply release the clutches, one at a time, and stand there and just keep rotating them through the full 360 degrees - do turns in one direction for a few minutes then turn in the opposite direction for a few minutes. I couldn't be bothered, so I got my 15yo nephew to stand there and do it. (I told him it would help build up his shoulders to play football!!).
Well, he did it, and it has helped quite a bit. But, they still do not swing real free when I balance, especially if I am only attaching my Megrez90.
Hope this helps.
Of course, the other suggestion I got was to strip down the gears and re-lube or rebuild, but I didn't consider that a real option for me.