Julia, if in your shoes, I would verify throttle cable adjustment. When adjusted properly, the return cable has a positive means of closing the throttle. The manuals list the adjustment procedure.
The idle mixture screws are only a backward patch when dealing with deceleration popping. On the VN, the cutoff valves operation should be able to verify by touch. They are both facing out.
Verify proper 'choke' operation visually.
If the cables are adjusted properly, high remaining idle will be caused by air (carb boots, vacuum leak, etc), or excessively lean.