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There is no issue. Basically, you are getting the max for Infinity 1 and there is room to spare to give you higher speeds if you were on Infinity 2 hence the higher noise margin.
There is nothing wrong with your noise margin. It is higher than the norm of 6dB due to your line being capable of higher speeds than Infinity 1.
It could be down to the game server that you are using and there will not be a lot if anything you can do about that.
The best option is connecting to the hub using Ethernet but if you are playing by wireless you could try changing the wireless channel. The channel you are on could be congested.