I cannot promise that will solve your problem, but if your problem were my problem, I would very much be trying that and running tests to document whether it improved things and, if so, by how much.
And I would expect to see some significant improvements when doing so. Here’s an example of the performance boost I saw when explicitly testing zvol vs raw file back-ends on the bhyve hypervisor under FreeBSD 13.1 last year:
This always shocks the hell out of people, but it’s a difference I’ve been observing for well over a decade. To be fair, it did shock me too, the first time I saw it… but like I said, that’s been well over a decade ago. At this point, I’m like “yeah zvols suck” and only bother to re-test it again before publishing something new where I know it’s going to reach a lot of people who will be surprised by that, and will really need to see it demonstrated. 