Empty probes when choosing not to store solutions in output

I have a working piezoelectric material model in which I use a frequency domain study to sweep the frequency; I then measure the electromechanical transduction as a function of frequency. I have defined a boundary probe that measures the current flowing through the device. The probe populates just fine when I store all the solutions in the output, but when I uncheck the "Store in output" box, the probe just returns zero for all frequencies. To be specific, I'm unchecking the "Store in output" box in the node: Study -> Solver Configurations -> Solver 1 >- Dependent Variables,

My goal is to run a large frequency sweep without having to retain the fields from each frequency step. How do I keep the accumulated probe information from every frequency step without storing all the solutions?

Thanks in advance for your help,
Matt