Jeff,The wobbly aspect is supposed to be there.To me,that is one reason unipivots are SO GOOD.Think "car suspension" here,with the pivotal nature(WOBBLE) coping with micro bumps and depressions in the groove,some dirt as well.Although there may be some responses to the contrary,and I can't proove anything,the opposite effect of the unipivot would sort of act like a plow through the groove.They work fine,but the unipivot design is a "KILLER".So don't worry!
Sounds like the damping fluid was too low,originally,and may have contributed to the distortion you heard.As I, and others, have stated previously,the stuff can make or break the ultimate performance of the arm. Also,make sure your anti-skate is where it should be.Check Graham instructions.Also,even though it's a pain in the tush,read all previous posts.If you want to grow in this hobby,then you can never get too much information.You can,also call Bob Graham.I have,in the past,with questions.He is a nice guy.
Although having a captive audience is nice,truthfully, I'm played out on this topic, of the tweaking of the arm.There are some very nice people that have responded to this thread,and you can find valuable info with many of them.Many seem to be far more experienced and capable than me.I've been at this hobby for 35 years or so,but,am constantly learning things.Don't be coy about trying something for yourself.
Anyway the 2.2 is a great product and should last a lifetime.I don't see any other arms,other than the very pricey and ergonomically difficult air bearing designs outperforming it to a great degree.If I ever get rid of mine that is the only direction I'd move in!
Good Luck!!