I played on 4 then moved up to 5 to try it out and I was all over the place, then I moved back down to four and it is alot more steadier for me again, two tips I can give you is practice practice practice, get a couple friends go into the BR arena and practice for a good half hour, hour, same thing with sniping as well, also just because your at 4 may not mean thats where your most comfortable with, there are pro players out there that have there sensitivity at 2 so don't always try and shoot for a higher sens, experiment with things and see how it feels and works out for you.