braining pink and slitting the skin are for different purposes. When you brain a pink, the purpose is to induce feeding. Cranal fluids have a stronger scent and seem to snap picky snakes back to their feeding instincts. Slitting (or perforating) the skin is to help the little guys digest. On a pinkie, the skin is the hardest organ to digest since it is the largest, so slitting the skin helps the snake digest and benefit from the meal more since they don't have to waste so much extra energy on digesting the skin.
If I were you, once they start eating pretty regularly after initially braining them, I would stop. If you continue, they may not take anything unless its brained. If you plan to breed, then they may "pass on" their feeding habits.
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