Hi Westi. I never pre cook my pastry bases, I make loads of quiche's and have never ever done this or any other pies etc. When I cook my quiche I just put the base in to the pie dish, then fill it with cheese onion and anything I want to put in. Then I put it on a heated baking sheet and put it in the oven after pouring the filling in cook for the alloted time and hey ho I have never had a failed pie.
Try it and let me know how you go.