Did you cut them or are you talking about individual country style ribs? I've never seen anyone sell Spare Ribs (St. Louis) like that, but country style (which are really ribs) are done that way.
What did they look like?
Here are individual country style ribs:
They will dry out, you're exposing more meat to the air/heat/smoke so they will dry out very quickly.
Also on ribs, never rub them overnight. The salt will cure the pork and make them taste like ham. If you like that taste, okay, but have a read through the threads and you'll see some recent ones about when to do it.
Good luck. The only suggestion I can say is check out this search for "country style ribs" for ideas:
Search on "country style ribs"