not gonna pretend i’m tech savvy enough to contribute much real stuff here, but did you have a glance at this?
“deferred render”, “cpu trick” etc etc,
also someone just posted this on steam earlier, which kinda sounded similar to the Nahimic issue yet a bit different, but curiously still sound related (others have similarly expressed their own issues, non nahimic related, to custom sound cards etc/background sound programs)