The FACET-II 10 TW laser system enables a variety of studies ranging from plasma wakefield acceleration over laboratory astrophysics to strong-field QED. While we successfully improved the performance of the high-energy laser-arm has, the much more versatile low-energy arm has yet to keep up. We report on the currently ongoing efforts to improve the performance of the low-energy laser-arm performance. The improvements are expected to enable studies, such as ultra-low emittance electron beams from plasma accelerators, plasma lenses, and novel ultrafast beam diagnostics.