Problems with playing backup games and burning

Hello
Im having problems playing backup games.

My GameCube is mod with a Viper GC Extreme. Bios 1.6 I change it to the 1.2 but doesn’t make a different.

Laser POT Adjustment is around 210ohms.

I’m using ridata mimi dvd-r 4x. I heard they were the best one that may work on the Gamecube

I’m using the Nero 7 to burn the image in 4x speed I haven’t try to burn it in lower speed.

I went through all the forums trying others things but don’t seem to work for me.