FBA has forced me to make some minor changes and right now I cook 3 hours at 250 then foil for 1.5 then sauce and drop temp a bit if they appear to be nearly done. They stay in for an additional 1.25 hours. I don't use liquids but do use solids and semi solids when wrapping. They do liquefy. I cook ST Louis cut spares.
Retired competition cook. BBQ mentor.