Results of a recent investigation conducted by the authors pointed out that the distortional strength curve (PnD) of the Direct Strength Method (DSM) currently codified for cold-formed steel (CFS) overestimates the strength of fixed-ended columns, particularly for those with (i) initial geometrical imperfections with ampli-tudes greater than 0.1 times the section thickness and (ii) exhibiting distortional buckling modes with various half-waves (nD). Therefore, this work aims to improve the PnD approach by incorporating the above effects in its design equations. Several numerical failure loads are obtained by means of GMNIA conducted with ABAQUS SFE models. The analyses consider various amplitudes of initial geometric imper-fections and different nD numbers. The results include elastic-plastic post-buckling equilibrium paths and failure loads, and collapse modes of fixed-ended lipped chan-nel (LC) columns. The steel material behavior is deemed elastic-perfectly plastic, and several yield stresses are considered, thus covering wide distortional slender-ness ranges. This successful endeavor provides encouragement to the authors in their quest for a safe, accurate, and reliable DSM-based design approach.