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@M_V
Definitely sounds more like an alignment issue than a cable pull issue.
Was the hanger checked by removing the mech and fitting an alignment tool or was it just eyed up? Was it checked in all directions? When I do a hanger I use the alignment tool in 12 and 6 positions to check what I suppose could be called vertical alignment and at 3 and 9 to check the horizontal.
If the lbs told you it was perfectly aligned already I'd be very skeptical. Very rarely are hangers 'perfectly aligned' even on bikes like brand new £7k P1 Madones.
If the hanger is definitely straight then could be the mech that's bent/twisted or even worn pivots could cause some sloppiness but really, I'd have another shop check your hanger first, and make sure they use a proper tool like the Park DAG-2.