Deployment Issue - MDT 2013 / OptiPlex 790 / Driver Injection

I'm trying to successfully deploy Windows 10 on a Dell OptiPlex 790 in my lab environment in order to push Windows 10 out to several of these PCs currently in production. Despite the fact that Dell does not offer a driver pack for Windows 10 for the 790, an upgrade to Windows 10 using the Windows Update method works fine; however, when I run a LiteTouch install, the keyboard and mouse do not work unless I am using a PS2 keyboard and mouse.

Upon further investigation, I found that the "USB Root Hub" device drivers are not properly installed on the deployed OptiPlex 790. My steps for a solution thus far have produced no meaningful results. I have tried the following:

1. From a working installation of Windows 10 on an OptiPlex 790, performed a full driver backup/export and imported into MDT 2013 Out-of-Box Driver folder for model-specific-injection task sequence. After deployment completed successfully with 0 errors and 0 warnings, the drivers are still not loaded and keyboard/mouse are nonfunctional.

2. Created an application package to silently install Intel Chipset during the LiteTouch OS installation, which includes the proper USB drivers for the OptiPlex 790. Results are the same; yet if I run the install after deployment, the drivers are installed successfully.

I'm just about out of ideas on this one, but I KNOW there has to be something that can work. It doesn't make sense that a manual install of the chipset can produce positive results but the same cannot be said for a LiteTouch deployment.

Any help or useful input on this would be greatly appreciated! Thanks.

I have a Dell OptiPlex 360 with Win10 and a Dell OptiPlex 755 with Linux Mint 17.2, both older and are the standard size cases. I've found with most computers that have the PS/2 ports also require a BIOS setting to Enable Legacy USB to get built-in support for USB 2.0 ports and USB keyboards and mice plugged into them. So far I've not seen BIOS support for USB 3.0 ports, have required software installed in/supported by the Operating System. Because of the change of some motherboards in leaving off the PS/2 ports I have changed my KVM from the PS/2 type to USB type.