You have two throttle cables, push and pull, the push cable is what is giving you an issue, if it is to long and binding up you will have this issue. I would check to see if you can route it better and lube the cable and see if that fixes the issue, next step would be custom cables.
I also found from a recent cable replacement that over-tightening the push cable can cause the throttle to slow return or bind. I think it has to do with the arc of carb arm swinging with the pull cable eyelet. You could try putting a little slack in the push cable....just a hair was enough to fix the problem for me.
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