I "believe" that I have resolved my input/video lag issues so I figured I would post my solution as it may be helpful to you.
First, from Windows Device Manger, disable all "Offloads" for your network adapter. Mine is an Intel 82579V Gbps. built into my ASUS P8Z77-V Pro. You can find this under the Advanced Tab of your NIC adapter properties. Basically disable ALL offloading.
Disable Large Send Offload (IPV4/6), then under TCP/IP Offloading options disabled ALL offloading, (uncheck IPv4 Checksum Offload, TCP Checksum Offload (IPv4/6) and ALL UDP Offloads.
Save settings and reboot.
Then, DL TCPOptimizer and then run it as ADMINISTRATOR.
Backup your current settings, File>Backup. Then select your NIC and "Optimal". Set the slider for your DL speed and hit apply. Reboot.
Mine was perfect after this. I have spent an enormous amount of time trying to resolve this issue and I hope it helps you as well.