The best advice I can give you is to stop playing around with your settings. Find something you're comfortable with and stick with it (that's the only way you will build muscle memory). The g502 has a good sensor (avoid super high dpi still they tend to produce negative accel even tho like I said, the g502 has a good sensor). WoT is probably a terrible measure for aim as it requires none whatsoever, just gotta be decent at leading targets vs shell velocity and... that's about it.
Generally you wanna be able to do a 360 without running out of your mousepad, you don't have want a sensitivity too high that would cause you to overshoot stuff but you don't want one that's slow to the point that it cripples your movements and reaction time.
source: played fps at a fairly high level for years