Dear Joe,
I could not replicate that issue. When I run a parametric simulation with the empirical trough model, the Solar Field ($/W) and Solar Field ($) output variables are both available in the Single Values table, both for the Base Case simulation and for the Parametric Set 1 simulation. I tested this in both SAM 2013.9.20 and SAM 2013.1.15. Could you attach a .zsam file to your original post that illustrates this behavior?
We're porting the CSP model code from FORTRAN to C++ now, so those should be available in the SDK with the 2014 version of SAM, which we plan to release in about a year (Fall 2014).
Best regards,
Paul.