Brewed my first sour, kettle sour with Goodbelly til 3.2. Gravity still the same at 1.04 after the sour. Pitched two packets of US-05 Friday night at 70F and the gravity is still the same today. Is the yeast dead? Should I make a hefty 3L started of 001 and pitch that? I am leaving out of town on Wednesday and don't want to come home to unfermented beer.