Media propagation delay and delay-rate induced by the water vapor within the Earth’s troposphere represent one of the main error sources for radiometric measurements in deep space. In preparation for the BepiColombo and JUICE missions, the European Space Agency has installed the prototype of a tropospheric delay calibration system (TDCS) at the DSA-3 ground station located in Malargüe, Argentina. An initial characterization of the TDCS performance was realized using the orbit determination of the Gaia spacecraft as a testbed. This work will further characterize the system by analyzing the BepiColombo tracking passes, which were recorded between March 2021 and February 2022 during the first two superior solar conjunction experiments. The performance exceeds the expectations based on the previous analysis, with an average 51% reduction of the Doppler noise when using the TDCS measurements in place of standard calibrations based on global navigation satellite system data. The tropospheric instability at long time scales is also significantly reduced, with most of the tracking passes now satisfying the Mercury orbiter radioscience experiment (MORE) requirements on two-way Doppler stability.