I agree that the RAID-0 could be considered 'overkill'. This is why I originally was using RAID-1. However, I started to see significant performance degradation. Then I learned that INTEL RAID only supports TRIM on RAID 0, not on RAID 1. So, it was more out of necessity. I suppose I could have had separate non-raid SSDs, but I chose to have a single volume, to keep it simple. The extra performance doesn't help. I'm getting a full 1000 MB/s read/write.
If I were buying new hardware, I would buy ONE NVMe SSD (non RAID), but I have to work with what I have.
After a few weeks with this setup, I've been quite happy with the performance and stability.
Now, I'm trying to fine-tune exactly which feeds I add. The biggest performance hit I see now is when I add too many feeds, or the very large feeds (BBC, hpHosts). I think I'm noticing excessive latency with large lists like those. Since I get very few hits on those lists, I've dropped them for now. I may add them back slowly to see if things change.