Hi Aaron thanks for sharing your solution with Rob!
Rob, thanks for reaching out to us, I am sorry this is not working as expected and I am happy to help!
Wireless keyboard and mouse lag can be introduced through a couple of factors, the most common issues we see are related to radio interference in the 2.4GHz ISM spectrum caused by USB 3.0 devices, like the USB 3 controller in the computer and in the docking station and broadcast from USB 3 connections and ports, WiFi adapters and networking hardware, and other consumer wireless devices. We can see if this is the issue by moving the mouse and keyboard closer to the Logitech receiver connected to the docking station to see if this helps to improve the behavior.
Replacing the batteries in the keyboard and mouse can help, depleted batteries will have weaker signal strength and can cause reduced performance especially at range.
Additionally we have seen overzealous power saving settings within the Intel Management Engine Interface driver cause intermittent keyboard and mouse connectivity when connected to an external docking station. This behavior primarily affects computers with 7000 and 8000 series Intel CPUs but may affect older computers with updated Intel Management Engine software. Dell identified the issue and provides a downloadable executable here ( https://downloads.dell.com/FOLDER03471411M/13/Dell_Dock_USB_TYPE-C_PATCH_2K0JJ_A00_SETUP_ZPE.exe ) that applies a registry fix to disable the power saving feature responsive for this behavior.
I recommend starting by replacing the batteries,s then moving the keyboard and mouse closer to the docking station with the receiver connected to the docking station.
Please let me know if this helps and we can go from there.