Why is it so hard to manage throttle when corners are this tightly packed?

The issue you are running into is almost certainly about how you manage the chassis weight transfer and the setup speed rather than just the throttle input itself. In a series of tight, immediate reversals, you aren't looking for a perfect line on the first corner; you are looking for a precise radius and an extremely stable departure speed that will allow the car to handle the opposing direction of travel instantly. My experience suggests that if you are spinning out, your entry speed is too high for the available radius, even if it feels right coming out of the last corner. When you hit the first corner, you’re likely scrubbing too much grip just to slow down enought to commit to the turn itself. Instead of trying to carry momentum thru the middle of the sequence, try treating each 'box' as a separate, short sprint where the goal is maximum exit velocity for the subsequent turn.

For the tightest sequences, you need to brake early enough to plant the car right into the apex, but you must start modulating the throttle far before the apex. The transition to throttle should be progressive. Don't wait til the steering begins to unwind to start pressing the gas. If you hit the throttle too hard while the car is still rotating through the turn, you’ll induce wheel spin and the entire direction change will likely fail because the car isn't settled. Focus on finding that sweet spot where the steering is centered and the car feels settled. That is your operational window. Once you find that speed for the first turn, it should naturally give you the momentum needed to hit the second turn correctly, even if the car is sideways for a split second as it changes direction. It's all about maintaining that stability.

I really agree with the point about treating each turn as a seperate sprint focused on exit velocity. It changes your whole mentality about the sequence. When I was practicing those long dense corners, the biggest difference I saw was messing with the rear suspension compression. Tuning that setup allowed the car to settle much quicker after a weight transfer, which gave me that stable departure speed needed to handle the opposing direction instantly.

I think the discussion keeps focusing on how to manage the speed once you are alredy turning, but the braking phase is usually where these tight sequences start falling apart. My biggest breakthrough wasn't about the tires or the suspension, it was the caliper bolts. I switched to those high-tensile stuff and it made a massive difference. Even a tiny amount of steering input under heavy pressure causes too much wheel movement if the hardware isn't rigid enough. It gave me the confidence to commit to the entry point becuase I knew the car was going to hold the line until the apex.

I keep noticing that when I try to hit the second corner, the steering wheel feels really stiff right when I make the turn. It feels like the car is pushing back on me even when I think it should be ready to go. I am trying to get the car to settle completely before I start turning in the opposite direction. Does the way I'm holding the wheel change how quickly the car feels stable for the next move?

Update: I found that focusing on the chassis weight transfer made a noticible difference in the entry. It helped me keep the momentum going through the first tight turn. However, I'm still fighting some stiffness when I initiate the next steering input. Does anyone know how to soften the wheel feel for those quick reversals?