Make sure that your wireless card on the PC is configured to connect to the ODP using proper wireless advanced configuration. This may vary greatly depending on your chipset.
As for configuring your hotspot, this is what I do to maximize gaming performance.
Be the only device connected
Here area couple screenshots to help out.
There are a lot of other little things that can help out. Run a namebench test to find the DNS servers with the best results for your relay path, which may be different than mine. I use 1 OpenDNS and one V/GTEi dns.
You may have to run several tests based on the amount of bars of 4g reception your getting.
Disable GPS. Set to 4G only to prevent wasted cycles polling 4g signal strength compared to 3g. Always use power supply if you can help it. Remove battery for this as the ODP has a propensity to overheat with some versions/firmwares.