Another set of ENSO proxy records is the Palmyra coral data reconstruction.
 Cobb, Kim M, Christopher D Charles, Hai Cheng, and R Lawrence Edwards. “El Nino/Southern Oscillation and Tropical Pacific Climate during the Last Millennium.” Nature 424, no. 6946 (2003): 271–76.
This set is actually one of the 10 reconstructions that comprise the Unified ENSO Proxy at the top of this thread.
So if the data is available for all 10 sets, there are lots of possibilities for analyses. Hope for the best Dara that the automated tools can help out.
It's like knitting or whittling as it is -- kind of relaxing doing DiffEq optimization by hand, but not really a productive use of time :)