weight correction factor being twice as much for runways with less friction.
It's not friction causing the difference - it is reverse credit.
FlightDetent explained in post #5.
You are not simply comparing only the effect of brakes and runway friction.
Autobrake Low simply sets a deceleration rate which might be achieved initially with reverse thrust and the brakes hardly doing any work.
If the published Landing Distances assume no reverse credit on a dry runway but use of reverse on the others, then your observations make sense.
See
https://www.fly19.net/wp-content/upl...erformance.pdf