Here’s what I experienced yesterday at a track of the same size:
Low grip. It was raining all day. Using Pit Shimitzu 24mm rain tyres. Very soft setup. Car was understeering but pretty balanced.
I tried both one-way and diff.
With a one-way it was much easier to control if the rear started to slide. Power on and steer. When the car is understeering the rear won’t slide around so fast and abruptly anyway.
Of course driving style plays a role here but I’d go for a one-way no matter if the track is high grip or low grip. Just set up the car accordingly.
It worked for me.
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