> For a twice larger "spin resistor", then, the equilibrium torque would be twice as large, and intuitively, the chain speed would be half as fast.

For the twice-larger resistor, the torque is the same, and the speed is half as fast. Can you explain why you think the torque is twice as large?

To move the 2x resistor at the same speed as the 1x resistor, you need twice the torque.