Vertical left-right level difference due to angular asymmetry characterises unilateral vocal fold paralysis. High-speed image sequences of three distinct auto-oscillating silicone vocal folds replicas are analysed simultaneously in both space and time with a dynamic vibration mode decomposition while imposing different degrees of angular asymmetry. From the modes eigenvalue spectra, it is found for all three replicas that the degree of angular asymmetry affects the decay of vibration modes. More in particular, for the assessed vocal fold replicas, increased mode decay is observed when the replica contains a stiff epithelium-like surface layer whereas it decreases otherwise. Spatial mode patterns near the glottal aperture reflect the mode order along the posterior-anterior direction and the imposed angular asymmetry reduces the spatial mode extent near the tilted vocal fold edge. Consequently, the quantified dynamic vibration mode properties, including the ones observed for higher order modes, are of potential interest for clinical studies involving high-speed vocal folds auto-oscillation imaging.