My first thought is that you need to tighten up on the clutch cable a little. Some folks suggest a little slack in the cable at the clutch actuating arm on the engine. I like to see no slack there. I don't make the cable bow string tight, but it has no slack or play. If you've properly lubricated the clutch actuating mechanism, cam, bar and bearing, a little contact on those parts won't hurt. Don't go overboard because that can put undue wear on the clutch components but the cable needs to be snug to assure complete disengagement of the clutch when you pull the handle.
Tom