Spices- build your own or buy premaid?

I buy dried peppers and grind them for my chili mix and new mexico red chili mix (for enchiladas and burritos). I've ground chipotle powder from dried chipotles and even smoked my own garden grown jalapenos to make dried chipotles and ground those but never achieved a great result.

I buy my dried peppers at the grocery store, usually the Fiesta near me as they have a huge selection of dried peppers. I use an old coffee grinder to grind the peppers and then mix as follows:

Chili Mix:
8 tbl Ancho
11 tbl Cascabel
4 tbl Arbol
4 tbl Chipotle
2 tbl Pasilla
2 tbl New Mexico
2 tbl granulated garlic
3 tbl fresh oregano chopped
2 tbl cumin
2 tbl smoked paprika

This make about 1 1/2 cups by volume of chili mix which is way more than I use in a typical 12 serving batch. I can't say exactly how much I put in my chili but I do put a few tablespoons in at the start and again midway through cooking. About 10 minutes before flame out I taste and add whatever amount more I feel like the batch needs and salt to taste. I put the leftover powder in the freezer and will use it in another chili if I make one within a month of the grind. Otherwise, I will grind a new batch as peppers lose a lot of flavor really quick....which is why store bought mixes are so-so.