It looks like the drag cube being used is for something other than the stowed cubes (just based on the numbers when I look at the part in flight with aero debugging on). ReStock defines several drag cube sets in the part config; I assume to override whatever KSP is assigning. With the stock chutes, they just use the stowed cubes since Real Chute does not make use of them or touch them at all, so it's just defaulting to stowed all the time (PACKED) - but with ReStock installed (and adding DR