Sweet Potato Biscuits

bluegrasstiger

Baking pros...I am using this recipe for sweet potato biscuits. They are delicious but don't rise as much as I would like.  Has anyone tried a similar recipe that is lighter and fluffier?  I want to try them with as pulled pork sliders next.

• 2 1/2 cup(s) all-purpose flour (King Arthur)
  
• 2 tablespoon(s) baking powder
• 1/2 teaspoon(s) salt
• 1/4 cup(s) packed light brown sugar
• 1/4 cup(s) unsalted butter, chilled
• 1/4 cup(s) shortening, chilled
• 1 1/2 cup(s) sweet potatoes, mashed
• 2 tablespoon(s) buttermilk
  

• Heat oven to 425 degrees F.
  Sift the flour, baking powder, allspice, cloves, and salt in a large
  bowl. Use the tips of your fingers to blend in the brown sugar.
• Cut in the chilled butter and shortening with a pastry
  cutter or pulse in a food processor until the mixture resembles coarse,
  crumbly meal. Then stir in the mashed sweet potatoes and knead until
  the dough just holds together.
• Turn the dough onto a lightly
  floured surface. Knead gently for 1 minute, adding a little flour as
  necessary to incorporate all the ingredients.
• Pat the dough in a 1/2-inch circle and let it rest, covered with a clean towel, for 10 to 15 minutes.
• Cut out the biscuits with a
  2-inch round cutter dipped in flour. Gather the scraps, pat out again,
  and cut into biscuits. Arrange them about 3/4-inch apart on an ungreased
  baking sheet and brush the tops with milk. Bake until golden brown --
  10 to 12 minutes. Cool the biscuits on a rack.

Sweet Potato Biscuit Recipe - Country Living (modified slightly from published recipe)