Bad disc read with backups?

[cl0ckw0rk1337]

I have a Messiah 2 installed in my ps2 and recently i've been having troubles with reading my game backups. First of all, the backups take several tries before they actually load. And once they do, any movie whether it be a simple company logo intro or a complex CGI plays terribly. Basically unwatchable because they skip and chop so much. The strange thing is that it isn't my laser simply failing on me. I've tried the originals and they still work perfectly fine. Any ideas? Thanks.

Media:
Usually Ritek DVD-R (shiny silver top, reflective purple bottom)
Tried:
Using a CD lens cleaner
Different DVD-R brands