Intrinsic CR diffusion coefficient, κ_cr, for simulations utilising two-moment CR transport with varying initial values of X_{cr, 0}. Scatter points represent the distribution of CRs as a function of κ_cr and X_cr at t=6 t_cool, with darker colours indicating higher CR-energy-weighted probability density in a logarithmic colour scheme. The corresponding 1D probability density of κ_cr is displayed with a linear scaling on the right-hand side. In the regime of efficient CR scattering (small κ_cr), larger X_{cr, 0} values increase the overall CR energy density in the CGM allowing for more CR energy to be converted into gyroresonant Alfvén waves and larger CR scattering rates, thereby reducing κ_cr (see Eq. (13)). In regions of a smooth CR distribution, the driving of Alfvén waves is inefficient in comparison to wave damping processes so that CRs are poorly coupled to the plasma, leading to a very large value of κ_cr.