Global climate models and reanalysis products have revealed large, persistent downwelling shortwave radiation biases over the Southern Ocean and coastal Antarctica. The biases are hypothesized to be caused by the incapability of models to accurately simulate the frequent occurrence of low-level mixed-phase clouds in these regions. In this study, we use the ground-based observations collected at Davis, Antarctica during the Precipitation over Land and The Southern Ocean (PLATO) field campaign in austral summer of 2019 to assess the capability of the high-resolution regional Unified Model (UM) to reproduce precipitating clouds off coastal Antarctica. We test the new UM double-moment Cloud AeroSol Interacting Microphysics (CASIM) scheme, running at the spatial resolution of 1.5-km and 100-m. We compare it to the previous single-moment cloud microphysics scheme at the same resolutions. The atmospheric configurations with double-moment cloud microphysics exhibit marginally degraded meteorological conditions relative to single-moment configurations compared with observations. For cloud properties, the UM regional models can generally simulate the phase, vertical structure and timing of events during the sublimation and precipitation periods. Nevertheless, overestimated ice water path and potentially underestimated liquid water path contribute to positive surface shortwave biases and negative longwave biases. The single moment microphysics simulates more liquid water path, though we suggest for the wrong reasons due to its ice nucleating parameterization. Our results suggest that the new double-moment cloud microphysics scheme, while having reduced performance in some respects, has large potential to better represent low-level mixed phase clouds for this region.