Even if you have low ping, depending on the amount of people that are connected to the same base station as you are, it can get laggy. I also have 4g on my parents house and when I go there even with relatively low ping ~50/60 every now and then I get some lag.
But is it that much that disturbs your play? On my case it doesnt affect too much.
Might help a little, it's made for people on laggy connections (it helps with registering hits)
Wait untill you can play with LAN and thEN complain
Windows + r --> resmon, end task svchost and windows update
And make sure you set your mobile hotspot to 5ghz