Hi McNeel
Currently the weights from SubDCrease are not inherited using OffsetSubD and Reflect, or rather: If you first turn on reflect, then crease and then offset, it all goes haywire. The crease isn’t carried over by the offset, and if the crease is then “re-made” on the driving side of the reflect, the reflected side doesn’t update. See video; hopefully it’ll make sense then 
TIA, Jakob