The casoli item - unbranded - is not a very good item to be completely blunt with you and they have been selling it cheap for some time.
Clutch plate stack is almost a zen art and needs some detailed, specialist setup with some slipper clutches. You only need to do a search on this board to find at least 10 others like yourself suffering from various issues around pack height, plain plate, friction plate, grauching noises etc etc etc.
I'm not surprised your clutch has only lasted 4000 miles. Depending on how you ride, and the clutch quality, this is a low to reasonable amount of mileage from the plates and basket on a clutch like this.
There are many on this board who could help more than I though