Low IOPS on SMB Share despite good read/write speeds

So I have an OMV server running on an old desktop (i5-3570k, 16gb, OMV running off a USB 3.0 drive). On this server I have 10 7200rpm 3tb HDDs currently running in RAID10 (previously RAID6 with the same issue) and they are getting very low IOPs. I'm getting reading around 15-20 when I run diskspd. I have a second server running 3 of these same drives in RAID5 and my IOPs are 200-300. Both server are connected to my other servers via 10gbe connections. If I run CrystalDiskMark on both servers both have similar read and write speeds that fully saturate the 10gbe connection. Anyone know why my IOPs are so low on the larger server? Built it with hopes of using it as a main hub to host my VMs off of for ProxMox, but with this issue it isn't really much of an option at the moment.

Let me know what hardware details you need. I can ssh into the server to run commands and grab necessary outputs.