If you took every bowling ball from one manufacturer(lets say Storm because I am more familiar with them) and layed them all out the same and put the same surface(lets go with 2000 abralon, because it is between 1500 and 4000) on the same oil pattern you would get completly different reaction between say a Triopical Breeze Hybrid and a Sync. The reason is the core and the cover. The core/cover combo on the Sync are way more hooking than the combo on the Breeze, even if you set them up exactly the same. Same thing between the Nightmare and Misfit pearl. Now if you set up a Nightmare and a Sync with the exact same layout/surface prep the difference would probably be very minimal as they are both designed for heavy oil.
Some core/cover combos are just designed to be stronger than some.
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