I have no input, since I've not had the chance to do a barrel sour yet. It sounds like a kick though, and I'm sure I'll get around to it. Hope your question gets answered, but I'm betting your BBB thread gets a better response than this one does.
"I can't believe how many people think Air Lock is pronounced Hydrometer." -BigKahuna
"If you gave me a beer with placenta in it without telling me I would kick you in the nuts." -ODaniel
"We be in a big hurry for dope beer with much alcamahol and flavor, quality, balance, and aroma don't matter. We just wantz to be druck, u know?" -Yooper