Try adjusting brake bias forward to relieve the rear tires of some responsibility — so they can work harder to help stabilize the car under heavy load. Into Sunset Bend the rear axle is slowing the car and holding the platform at the same time; shift some braking work forward and the rears get their grip budget back.
Rear kept trying to swap ends the second I got on the brakes. Nudged the bias forward a bit and it calmed right down, still rotates fine.
Went softer on the rear bar and the back end stays planted while I'm trailing the brakes in. Car feels a touch lazier but I'll take that over the rear stepping out every lap.
If the rear's skipping over the bumps on entry, try backing off the rear rebound. Tires actually stay on the ground. Did more for me than messing with bias ever did.
Rear kept getting loose about halfway through the long right once the speed's up. Bit more wing and it's settled through the whole thing. You lose a little on the straights but in traffic it's worth it.
Kept washing wide at the apex over the bumps no matter what I did with my line. Dropped the front pressures a touch and the nose started biting again.
Rear felt glued, car just wouldn't come around under braking. Took some preload out and now it rotates into the corner without getting snappy on me.
Was lighting up the rears every lap coming onto the pit straight. Went a little lower on rear pressure, more rubber on the road, problem mostly gone.