I bought this pattern at a show. I contacted the designer who said I must have gotten an old version of the pattern that was using a different yarn and that the current instructions call for LUXURY, 100% Superfine Alpaca. The yardage needed is -- 19 balls -- 3,496 yards (3,192 meters). Needle size US 7 (4.5 mm).
Now I see why I don't have enough yarn since I purchased the amount that was printed on the pattern!
At least I know why I didn't seem to have enough yarn. Since I have the correct gauge using Knitpicks Wood of the Andes I will order more of that yarn so I can finish the project.
Thanks for your help.