"Aren't really warped", is not a good working clutch sentence, at all. You physically check them for deflection on a flat surface and feeler gauge, carefully. Inspect for uneven wear. And discoloration, any color, they are warped/trashed. The basket and inner hub, they both get grooves/divots from all of the plates, inside and outside, it will drag and slip. Worn or weak springs? Get stiffer, even a pair of real stiff ones(2)will help engage/dis engage, and keep from slipping the most you can. If it over heats it, it will destroys it. Check the dip stick oil smell frequently, really bad odor, toasted, start over again. And the clutch has an estimated clutch life in the manual. Use it for reference on how you are wearing out clutches, and adjust your service accordingly. Piece of cake, German chocolate! Vintage Bob