Thanks for the rib recipe...did smoked spare ribs in a traditional weber(kettle)grill using a dry-rub(let sit overnight in the ‘fridge). They actually turned out pretty good(for a first time)but wish I’d done the cider vinegar spray towards the end to add that tartness you mentioned to complement the heat from the(dry-rub)pepper-flakes.
I’m pleased it worked out.. Have a great New Year.. Carlo