I'll give this a go. Was also having a chat with a mate and he indicated that apparently a ferrule is only required on the larger spinning side of the adjuster, not the smaller static end (I have them on both sides). I'll have to find a pdf of the adjuster manuals somewhere and see how it's done.
Could easily just be the cable housing need compressing.
Start again, set adjuster to zero, then make sure cable really tight first time round.