the killstreaks are meant to feel slow, that is not a xim problem
however there are two things you can do
1) use the controller for killstreaks
2) use a vehicle config for killstreaks
basically a vehicle config has a much higher XIM sensitivity, lets say 3 times as much
that way you can move the killstreak much better
also a ballistic curve can help with some boost
you create such a config by doing a swipe to the right on the config editing mode in the XIM Manager
first screen = HIP, one swipe to the right = ADS, another swipe = new sub config = vehicle config
