This reduces the C-H and C-C distances, shifting populations towards the attractive regions of the RPFs, specifically within 2.1-2.7 Å and 2.9-3.2 Å for C-H, and 2.9-3.4 Å for C-C pairs. To address DFTB3's shortcomings in modeling hydride transfer reactions, one could consider adjusting the attractive regions of the C-H and C-C RPFs to be more repulsive.