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I really don't know of a way to keep pies from bubbling over, so the next best thing I can tell you is how to keep them from burning in your oven. When I bake a pie that I suspect MAY bubble over (apple, blueberry, etc.), I always place an aluminum foil wrapped cookie sheet on the rack under the pie. This way, if the pie bubbles over, the mess is contained on the foil wrapped cookie sheet, and the foil can just be removed and thrown out afterwards, rather than having to clean your oven! (And I don't care WHAT manufacturers say, no oven is ENTIRELY "self-cleaning"!)