Id like to know from experience the difference in plastic only between these discs. I throw jks and have them from soft medium to more stiff all depends on the run but the plastic and grip is the same. are yetis the same plastic as jk or different as you can find soft to stiff yeti as well but stiffer seems more common. not talking stiffness between jk and kc mold but is the plastic/grip the same as jk which is rubbery.