Should I check queue depth first when my Fanxiang S790 lags in Lost Ark?

4K random read dropped to 32MB/s during raid loading. I used GamePP NVMe Queue Depth Config to reduce depth to 1024 and enable forced write cache flush. Setting virtual memory to half disk space increased read/write conflicts. Now 4K random read is stable at 65-70MB/s per AIDA64, and delay is 1.0-1.3s.