Question regarding High CPU I/O Waiting

Hello again,

After playing around with my settings a bit more, it seems that I’m still having this high cpu iowait problem going on.

https://chiaforum.com/t/i-was-sick-of-dealing-with-iowait-as-a-bottleneck-for-the-last-week/598
However, reading from that post up above, it seems that adding more nvme could possibly solve the problem. Is this true?

Also, monitoring my iotop, it seems that kworker is causing all the iowait. Is it because of phase 1 of plotting that causes the high usage of kworker?
https://imgur.com/a/pMcLMc1

Thanks again.