Preheat the oven to 350° F. In a large bowl, toss together strawberries, strawberry jam, maple, cornstarch, cinnamon, bourbon, and vanilla. Spread the fruit out into a 10-12 inch baking dish or cast iron skillet. To make the topping, combine the oats, flour, brown sugar, cinnamon, and salt in a bowl. Add 8 tablespoons butter and cut the butter into the dry ingredients using a fork or pastry cutter. Sprinkle over the fruit. Cover with foil and bake 30 minutes. Remove the crisp from the oven, remove the foil, and arrange 4 tablespoons butter evenly on top. Drizzle the maple syrup over the butter. Bake, uncovered another 15-20 minutes. Let cool slightly, then serve with ice cream.