Regarding CS2.4 resistors. As I've mentioned, I have identified thermal dissipation and stability as worthy of attention. Doubling in parallel is a good way to do that.
However that 16 ohm resistor does not need a higher value, being in series with a capacitor that blocks low frequency current flow.
Resistors that are worthy of attention include: Woofer R1 - 4 ohm, and R2 - 2 ohm.
Coax R5 - 30 ohm, and R6- 3 ohm. Those high-current resistors are most worthy of Mills (etc.) upgrade since current flow induces noise and heat induces instability.