Unfortunately the cam doesn't have the dynamic range of our composite cone/rod eyes or the processing power of the visual cortex intergrating these discreet inputs from the cone/rods.
You can't shoot what you are seeing at night with something like this.
Tripod, focus, s/setting etc aside, a early dawn or dusk shot will probably produce a better image of what you are seeing.
You need some ambient light otherwise you wouldn't have enough dynamic range to capture anything except the flame... which isn't impression with no reference points.
Stopping down to len's sweet spot or a bit higher will help if you can keep the shutter speed high enough. The velocity of the gases can be fairly fast so the flame is in constant flux.
Freezing it for a clean shot is an issue without completely drowning out everything else or blowing out the flame exposure setting.
Play with different metering modes; this may help once you get the ambient light level sorted out.
Lol, it's easier to street shoot gang bangers than gas flares at night