Liteon 811s. How to burn 4x dvdr at 8x?

Bought a Pacific Digital 8x DVD+/- last year which was infact a 811s

Anyway its flashed with HS0R

I have 4x Maxell +/- discs here. They are all mostly RicohJPN and Ritek R02.

Now ive read that these discs do 8x perfectly but problem is nero only shows 4x and dvdidentifier only shows these discs can do 4x. How can i change this to 8x and how do these discs handle 8x?

I mean can i test these discs at 8x to see how they perform and what results should i look for