Nero & Plex 24x =Max Burning, but I get seek ERROR when overburing Uh?

[Scandels]

No the CD is not an orginal.
Its actually a Divx movie. That I know can be overbured with a plex 16x. The problem is i don't know how. I do not wanna mess around with 99min cd-r's. I just want to overburn on a few 80min disc's that I have. I know that the 99min ones are not supported by most players etc. There is a presedure to overburn correctly, I just need to know what it is.
Feurio reports I can get past 81mins so what do I do to get that?