Campagnolo Super Record mechanical left shifter issue

[wilwil]

This is a post 2015 shifter and cable seems to be rubbing/binding inside the shifter. Its difficult to push the cable through as the hole in the white ratchet bit doesn't line up exactly with the the exit hole. The problem is between the exit of the white ratchet bit and the exit hole of the lever casing. The hole in the white ratchet bit is fine. Is it normal for the cable to feel tight inside the left shifter? I am trying to work out why the shifting is not great on the front mech and seems to require a great deal of cable tension and have arrived at this being the possible cause.