Hmm, I counted it manually and thought I got to 261 o.o
2 Bone Walls and 10 Pends might otherwise have to go.
The thing is that most spare cards are Darkness cards, and when we have to discard cards it's virtually impossible to maintain that strategy since we don't have cards for that, meaning we mostly keep the Darkness cards. That on top of the possibility to convert salvage into pillars/pends leads me to believe it's OK, but do tell me if I'm wrong