I've been using Pie: 300 Tried-and-True Recipes for Delicious Homemade Pie for years. I prefer the pecan pie recipe from Cook's Country though.
Without knowing your starting recipe I can't offer too many ideas to refine what you are doing so instead I'll offer a few of my favorite general tips.
1) I usually do half butter and half lard, this usually give me a texture easier to work with and still a solid butter flavor when cooked
2) I use a pastry cutter with blades (not wire) and a dishwasher safe handle to cut in my fats. I have used a food processer in the past but don't usually like having to wash it for only 1 pie crust. If I'm making several (6+) pies then it's worth cleaning and I'll pulse in the food processer instead
3) If the crust isn't coming together I am willing to put an extra TBS of water in, when I take a fistfull of the dough it needs to be able to hold together when I squeeze
4) After chilling I will roll out, fold into thirds and roll again and again to make several layers (like you see them do for croissant and puff pastry). This helps bring together the last few crumbles and improves my final texture.
Of course! I got these little leaf shaped crust cutters on Amazon Yunko Cake Leaves Baking Pie Crust Cutters Set of 4 https://www.amazon.com/dp/B00LWRUKEG/ref=cm_sw_r_cp_api_glt_fabc_BBZ2DZ0SKXAHTJ93MY02?_encoding=UTF8&psc=1
450 sounds high Have you tried a combo of Vodka and cold water ? Vodka won’t stimulate gluten . Do you have a oven thermometer ?
Try 425 for 10-12 minutes and create a foil ring around to not burn the edges, Pull out and bring your oven to 375 Pull the pie weights and parchment paper off Dock your crust , do a egg wash & heavy cream w a brush. Pop it back into the oven for about 10-12 min without the foil ring .
What kind of flour are you using and how are you handling your dough when you incorporate the butter into it ?
If you have warmer hands you might want to invest in a food processor and a silicone pie mat And use the corners of the mat to fold your dough to minimize contact . Also try sticking your roller into the freezer .
Hope this helps
Hoosier Mama Pie ...https://www.amazon.com/Hoosier-Mama-Book-Pie-Techniques/dp/1572841435 look her up on You Tube for more info
The sprinkles are Wilton golden pearls. I kinda just stole it from the cabinet, but I added them in too soon while the pie was still hot, so they melted a little. :P