We have reparameterized the GFN1-xTB model to yield better binding electronic energies and gradient norms for atmospherically relevant clusters composed of the following species: sulfuric acid (SA), methanesulfonic acid (MSA), nitric acid (NA), formic acid (FA), ammo- We tested two new configurational sampling procedures with the new parameterizations being employed in the xtb and CREST programs. The first workflow, denoted as "improvement workflow," is based on improving the best structure currently known in the literature with CREST and then doing the DFT calculations. The second workflow, denoted the "independent workflow," starts by configurational sampling using ABCluster, followed by xtb, CREST, and then DFT. Using the two workflows, we find cluster structures lower in free energy for the following (SA) 4 (EDA) 4 , (SA) 4 (AM) 4 ,(SA) 4 (AM) 1 (MA) 1 (DMA) 1 (TMA) 1 , (SA) 1 (MSA) 1 (NA) 1 (FA) 1 (AM) 4 and (SA) 1 (MSA) 1 (NA) 1 (FA) 1 (AM) 1 (MA) 1 (DMA) 1 (TMA) 1 systems in all cases compared to the best-known value in the literature.