In terms of software yes it would be a definite upgrade, the XR1000 won't get DumaOS 4 and we've got some good features coming.
Realistically though, you're getting a great ping when gaming, if you're wanting to upgrade to reduce that ping even further, even with DumaOS 4 that's going to be quite hard to do. There will be a limit of what the minimum ping you're capable of getting to the servers is and you're probably not far off. Given you're also just playing one game mainly there isn't much variation you need to do.