The link you supplied is what I am using.
Here are my Luma3DS v5.4 Configuration menu settings:
Screen-init brightness: 1
New 3DS CPU Clock+L2
Autoboot SysNAND
SysNAND is updated (A9LH-only)
Force A9LH detection
Show current NAND in System Settings
Show GBA boot screen in patched AGB_FIRM
Enable splash screen with no screen-init