Welcome to cdfreaks.
Any config I can change so it burns at 8x from the start?
Sorry to say, but the answer is no.
Write speed strategies are laid out in firmware depending on media.
Strategy you are talking about is named Z-CLV (Zone Constant Linear Velocity).
Example; drive starts to burn at 2.4x, then jumps to 4x, then 6x and finally at 8x.
Also posted here.