Place wings in a single layer in the pressure cooker.
Whisk together bbq sauce, ketchup, balsamic vinegar, Worcestershire sauce, sugar, mustard, chili powder, cumin and cayenne powder. Pour over chicken.
Lock lid and seal vent. Set to manual mode, high pressure for 10 minutes.
Perform quick release.
Remove chicken pieces using tongs and place on a baking sheet.
Set cooker to saute mode and let sauce cook down for about 10 minutes.
Sprinkle and whisk in cornstarch to thicken sauce.
Baste sauce onto chicken wings. Broil for about 5 minutes. Add more sauce to each wing and Broil for another 5 minutes. Flip wings and baste. Broil for 5 minutes.