Hi Danny,
Yes the higher you lift the cam the more difficult it becomes to fit the cable without bending it and creating another issue. I have a small round file and I file in the slot the cable comes through on an angle so that the cable has a more friendly entrance so you can easily clip the outer cable in its locating slot. I fit a 6mm screw in the cap so I can adjust the idle or if you have a G4 cap you can use the idler screw Victa fitted to those carbies