the big backend will come with the core/cover combo itself.
i really dont think you want to enhance it anymore than it is already.
move the pin 2" right, and it will be an uncontrolable mess as soon as it hits 6" of dry boards, and look like plastic with carrydown.
up to you my friend, if you want a cheaper alternative with max backend, try a smokin inferno with brunswick's 1L layout, but i think doing that with the cobalt will make it a $200 condition specific ball.