at what temperature should apple-choco pie be prepared?
The pre-baking of the pastry is missing a "how to tell when it's done" instruction. My guess is there's a good chance you didn't bake it long enough. In general, when pre-baking plain pie crusts, you're aiming for golden brown. It's a bit harder to tell when it's got the brown from the chocolate in it, but if you look closely you should still be able to see the change in color. It should also just look cooked - a bit of texture develops on the surface and it appears to have dried out. As SAJ14SAJ suggests, you also normally pre-bake crusts with weights in them to keep them from bubbling too much. (This is also why you poke holes.) A common method is to cover with a piece of foil, then fill with dry beans.

As for temperature, in my experience, pie crusts are generally pre-baked at 350°F. But the important thing is to check and know when it's done.

Now, baking the filled pie. This is the weird thing - usually apple pies don't use pre-baked crusts, because it takes more like an hour to fully cook the apples til they're soft. Maybe you didn't like the apples because they were still crunchy and a bit raw, and the flavor hadn't smoothed out with the nuts and sugar? If that's the case, you may want to skip pre-baking the crust, and instead fill and cover the pie and bake it all together, for 45 minutes to an hour. If the crust browns too much, you can loosely cover it with foil.

If on the other hand, you like the apples like that, or the quantity of apples is sufficiently small that they're actually cooking fully, then sure, stick to the recipe. (You could increase the temperature to 350°F here too, but that'll mean the crust is done when the apples are even less done.) If you've properly pre-baked the crust, you shouldn't have problems with the bottom of the pie being undercooked.