i have noticed the same for my RDiS200 & Dual G butt caps... if you just want a more flared butt cap for the Yonex, someone recently changed to a Wilson one, as it is more flared than the Yonex butt cap.
i don't know how easy it is to swap from the Yonex handle to the Head TK82 pallets... (don't recall Yones uses pallet system..)