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Ah, yes, the mount MUST be balanced when doing this.
Because, when you rotate the worm against load, the mount will behave more or lees OK (except for increased friction resistance due to pressure on worm threads).
But if you do it in the same direction (where mount wants to go because of unbalance) the mount first tends to stay where it was due to friction. But when the worm touches and pushes the teeth of the gear, the friction will "get free" and the mount will "fall" due to the unbalance until it hits the other side of the teeth, where it will stop (friction again).
And so on. So the balance is paramount here.
Also, I forgot to mention, your "sticky spots" may be due to too much pressure on worm ball bearings, or dirt inside them... or both.
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