I second the 5 min. and dry hop split. Cascades isn't much as a bittering hop. If you did want to use it at 60, calculate the add based on AA%, because centennial typical has 2-3 times the AA.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
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