Proxmox CEPH performance

As if this subject hasn't been brought around enough I thought I would open a new one cause I'm a bit confused.
We have two clusters

==| Cluster 1, dev |==
Proxmox - Virtual Environment 5.4-3
4x Dell r710
Between 72-128 Gb ram each
H700 - sda - 2x500gb spinning, 7200rpm RAID1
H700 - sdb - 1x2460 Kingston v300 SSD RAID0
2x1Gb bond0 - Management
2x1Gb bond1 - VM Networks
1x10g NIC for CEPH network

==| Custer 2, eventual production |==
Proxmox - Virtual Environment 7.0-14+1
Dell c6220 with 4...

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