I bake pies in the lower third of the oven, not the centre. That helps the bottom crust to brown.
I also preheat the over to 400 degrees and bake it at that temp for about 15 minutes then lower the temp to 350 or so and finish baking it.
If you butter the bottom crust before adding the filling it will help to avoid a soggy crust that soaks up all the liquid too.