Yes this is an external hack and since it is external all of the math and information needs to come externally. This means that we can only do so much with the hack considering what little information the game gives us in memory about what is going on. The aimbot is off a bit, and making it better would be good, but that is very complicated math and a lot of assumptions on our part. It may never be perfect. Since the aimbot aims at the middle of the body from top to bottom. When a player runs, his hitbox moves away from where we aim, and the location of the player is based on his feet where his hitbox does not move at all. So it is hard to determine where his hitbox is going to be when he runs in any given direction.
If you want to remove the killstreaks number, go into the config file and search for ....
change it to
KEY_KILLSTREAK = "ON" # always on
Then restart the hack.
KEY_KILLSTREAK = "OFF" # always on