What media should I use
 

I have a Plextor 12/10/32a and using Clonecd to back up PSX games, reading and burning at x1 speed. I find with some of my back ups, particularly Tony Hawkes Pro skater2 the video and sound skips. Is this something I just have to live with or might it be the quality of discs Im using? Or maybe use different software? Currently I'm using Memorex Black-Premium quality.

Thanks.