Dear Shevy,
When you run a parametric simulation on the target solar multiple, be sure to show the "Annual net thermal energy production w/ avail derate" output variable in the parametric results to confirm that the field size is actually increasing. In some cases, depending on the loop configuration, the actual solar multiple may be different from the target.
In my tests, for a 6 hours of storage capacity and default cost and financial assumptions, the LCOH increases with solar multiple.
The label for the LCOH variable appears as LCOE in those results because it is the same variable for other models that use the "LCOE" nomenclature.
Best regard,
Paul.