Beat the coconut oil, on medium-high speed, with an electric mixer for 1 minute. Add the baking powder, cumin, salt, and beat for 1 minute to incorporate into the coconut oil.
Add half of the masa harina to the bowl, pour in half of the vegetable stock, and beat to incorporate. After it is completely incorporated, add the other half of masa harina, vegetable stock, and 1 ½ cups of the guajillo chile puree. Beat at low speed, until thoroughly mixed. It should have the consistency of a thick cake batter. If necessary, add more vegetable stock until you reach that consistency. Taste the dough, and add more salt if necessary. It should be a little bit salty.
For lighter and fluffier tamales, let the dough rest for an hour in the refrigerator. Remove the dough from the fridge and rebeat it, adding enough liquid to get it to the consistency it had before.
Remove the corn husks from the water and set on paper towels. Reserve the largest husks to wrap the tamales and the small ones to line the steamer.