Extremely Slow USB 3.0 Speeds When Transferring Large Amounts of Video

Hi there,
I am transferring large amounts of footage (250GB-1.75TB chunks) from 5x 5400rpm 2TB drives to 5x 7200rpm 2TB drives simultaneously (via 6x USB 3.0 connections and 4x SATA III, with copy/paste in explorer) and the transfer speeds are incredibly slow. Initially the speeds show up as quite fast (45-150mb/ps+) but then they slow down to around 3mb/ps.
The drives have not been manually defragmented but the vast majority of the files on each are R3D video files.
I am wondering if the amount of drives/data being used/sent is what is causing such slow speeds or if there might be another culprit? I would be incredibly appreciative to learn of any solutions to increase speed significantly. Many thanks...
Specs:
OS: Windows 7 Professional
Processor: i7 4790k
RAM: 32GB
GPU: Nvidia 970 GTX

If the USB ports are all on the same controller, they share their resources, so the transfer rate with 6 ports would be max 1/6-th of the transfer rate with 1 USB port if we disregard the overhead. Add that overhead to the equation and the transfer rate goes down even further. Now take into account the fact that you are copying from slow 5400 RPM disks that effectively max out at around 80 MB/s with these chunks and high latency, add the OS overhead and these transfer rates do not surprise me.

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iMac - model: iMac8,1
1 2.8 GHz Intel Core 2 Duo CPU: 2 cores
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S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted>: 209.7 MB
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EPSON USB2.0 MFP(Hi-Speed)
Apple Computer, Inc. Apple Cinema HD Display
Apple, Inc. Keyboard Hub
Apple, Inc Apple Keyboard
Apple Inc. Built-in iSight
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Generic USB Ear-Microphone
Apple Computer, Inc. IR Receiver
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Anywhere
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[not loaded] com.devguru.driver.SamsungACMControl (1.4.16 - SDK 10.6) Support
[not loaded] com.devguru.driver.SamsungACMData (1.4.16 - SDK 10.6) Support
[not loaded] com.devguru.driver.SamsungComposite (1.4.16 - SDK 10.6) Support
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[loaded] com.parallels.mobile.kextloader.launchdaemon.plist Support
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[loaded] com.adobe.ARM.[...].plist Support
[loaded] com.divx.agent.postinstall.plist Support
[running] com.genieo.completer.download.plist Support
[loaded] com.genieo.completer.update.plist Support
[loaded] com.google.keystone.agent.plist Support
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Garmin Express Service
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KiesAgent
EpsonRegReminder
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Google Earth Web Plug-in: Version: 6.1 Support
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OfficeLiveBrowserPlugin: Version: 12.3.6 Support
OVSHelper: Version: 1.1 Support
AdobePDFViewerNPAPI: Version: 10.1.10 Support
FlashPlayer-10.6: Version: 15.0.0.152 - SDK 10.6 Support
DivXBrowserPlugin: Version: 2.1 Support
Silverlight: Version: 5.1.20913.0 - SDK 10.6 Support
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GarminGpsControl: Version: 4.0.1.0 Release - SDK 10.4 Support
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OpenIE
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Time Machine not configured!
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146 MB Inactive RAM
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