Rather than completely re-parameterizing the method, which could compromise its performance for equilibrium structures, our selective modifications preserve DFTB3's established accuracy while correcting its behavior in transition state regions. This strategy follows similar approaches in the literature for other chemical processes. To our knowledge, this is the first systematic study examining the effects of modifying C-H and C-C repulsive potentials to enhance the current DFTB3 parametrization (3OB-3-1 set of parameters) specifically for hydride transfer reactions.