These old clutches when set up right are FINE and can work well!
Good upgrades that help are a Ram Jett clutch retainer.
Keeps the basket from wandering back and forth as much.
Long bearing clutch basket, evenly distributes load on bearings.
New clutch basket if studs are significantly grooved. 3 or 5 finger.
I like the 3 finger stock style better, seems to be a little easier to adjust.
I also like the Hayden M6 automatic primary chain adjuster.
You can fix this. Have patience. It's not rocket science. When you get frustrated, walk away. I see you've found
www.shovelhead.us.
Between these 2 sites you should be able to do it.
Forget about the 13/16 inches. Move the lever where you can get the system to work.
Good luck.