Because strawberries ooze out a lot of juice when they bake the bottom pie crust can get a bit soggy. You can do two things to avoid this: brush some oil or maple syrup on the bottom crust, which will create a barrier between the juices and the crust. The other thing you can do is to pop the baking sheet in the oven as it preheats, so the sheet is hot when you place the pie on it. This will also help the bottom crust cook faster.