New RN316 - Network Access is SLOW

Hi!  I've been doing a lot of reading on the community forums about slow network performance when accessing shares via Windows Explorer and I'm experiencing the same thing.  I've checked most of the solutions I found on the forums, and nothing has helped, but I thought I would throw my question out there to see if you have a solution before I call support for further assistance.

Here are the details of my network setup and additional information needed to help diagnose my issue:

NAS:  RN316 Diskless - Firmware Version 6.9.2 - One 4 TB WD Red drive / Four 2 TB WD Black drives (they were moved over from a WD4000X that had NICs die) - 5.69 TB free of 7.26 TB total - X-RAID running on RAID 5 - Bond between both en0 & en1 enabled with Active Backup enabled - Anti-Virus is disabled, File Search is disabled, SMB only protocol on all folders, DLNA also on respective media folders - Permissions wide open, everyone has access to Network Access, File Access is set Owner and Group to admin - ReadyCloud access turned on - Plex Server running.

Main Issue:  Accessing and opening network documents such as Word, PDF, etc take anywhere from 15 - 30 seconds before they open.  Saving Word documents makes the documents appear to lock up and go to "not responding", then they come back after the 15 - 30 seconds.  File transfer speeds are decent, running on average at 10 Mbps both ways.  My old Windows Storage Server WD4000X NAS never had this issue, only since I installed this new NAS on the network have I had this issue

Main Wireless Router:  Netgear R7000

Secondary Router:  Netgear R6300v2 - Being used only to create physical NIC ports, not used as a wireless network extender

PC's:  All Windows 10, either Pro or Home edition - All Windows Updates installed - All using Wireless AC protocol with good signal

Here are the things that I've tried to fix the issue:

1. Enable/Disable Bond between en0 & en1, tried several protocols, no difference

2. Permissions - Network Access is open to everyone, File Access set to guest/guest, changed to admin/admin, no difference

3. Plex Server - Enabled/Disabled, no change

4. Verified SnapShot management set to Smart

5. No backups running

6. Logged out of ReadyCloud app on desktop

So, anything I'm missing, or do I need to call support at this point?  Your help and time reviewing my issue are appreciated.  I look forward to seeing what your suggestions are.

Thank you!