[...] I tend to miss with my shotgun when playing as soldier. I rather have high sens for my RL and low for shotgun. [...] But I feel that with the rocket launcher you don't have to be that precisely unlike your shotgun (hitscan weapon). I will atleast try this but who knows, maybe I will play worse, maybe I won't. :) Oh and thanks for all the help by the way guys!

Why would you want different sensitivities for different weapons even...

He is right, if you have your sens changed between every weapons you are going to be even worse than you are right now, you could maybe feel good and have the feeling to play better because you will be more focus on your new sens than on your gameplay but you'll definitly be worse. The best advice i can give you is to stay with the same sens as long as you can, it'll definitly be better than switching it every 5s. Even thought exfane use a switch sens between his rocket launcher and shotgun doesn't mean you can do it, w/e just keep the same sens :D