Improving my ZFS config with SSD-s

Hi all, I'd like to re-create my existing pool and enhance it with SSD-s. 4-wide raidz1 with 14T Seagate Exos SAS drives at the moment.

I already added a cache device, a whole SATA SSD, an older 256G one, reliable but apart of small files it's even slower than my HDD-based pool itself :) (Pool is at around 650-700MB/s, SATA-SSD somewhat slower).

So my intention is to reconfigure things a bit now:

• add 2 more disks
• re-create pool as a 6-wide raidz2
• use one 2TB NVMe SSD with lots of TBW capability as cache
• use 3 additional high-endurance SATA SSD-s in 3-way mirror as SLOG (10% each) and special devices (90% each) for metadata and small files.

Does it make sense ?