The most important thing in any TV for gaming of any kind is to DISABLE all the image processing features to reduce input lag and other stuff that can mess up picture. You mention that your TV has Game Mode, its very possible that turning it ON TV will automatically choose the best settings but its not always the case. What should you DISABLE? I dont know your set up but it’s usually things like: dynamic contrast, dynamig brightnes, colour enhancement, motion improving features called differently by each manufacturer for example in my tv its called Motion Plus and i can set it to off, low, medium and high, you want that off etc. Its not a rocket science, usually instruction manual explain features so you know if you want to keep it or turn it off.