To investigate the potential dependence on the approximations used for obtaining phenomenological rate coefficients, the pressure-dependent network was also solved with modified strong collision assumptions, shown in Figure of the ESI. † In this work, the modified strong collision treatment shows significantly more stabilization of RO 2 than the reservoir state approximations. These stabilized RO 2 radicals, also form more stabilized intermediates at lower temperatures the predicted when using the reservoir state method. The higher rates of stabilization indicate the modified strong collision method leads to the prediction of faster energy transfer than does the reservoir state method. This might be due to how the collision efficiency is approximated in the modified strong collision method, which has led to inaccuracies in highly activated systems before.