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I don't know for sure but if there were a shock to the worm and it got damaged wouldn't cause a sudden spike in the PE when the worm turned to the damaged area rather than overall poor performance?
SB definitely had quality control issues with their worms (sounds funny) early on. So its quite possible you have a dud worm.
As to the balance thing yes it should not really be required and I think in my case it was symptomatic that the cam pin had slipped and needed readjustment. The off balance thing was more of a quick fix until I reset the famous cam pin (what a design??!!).
Perhaps see the you tube videos about the cam pin because it can come loose at least on the original PMX. I can't say if they changed the design of that in later models. I hope so as it was a weak point of the original design.
Greg.
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