Although I agree 100% that it's way to good as it is, removing the shock effect would be just stupid, if it came to that you could just remove the gun itself, because there wouldn't be a reason to use it unless you for some reason haven't already found a better gun on the map (galil, famas, ak etc.) Of course the detecives should be dangerous, that forces the traitors to act more carefully, to kill people with stealth, hiding bodies in places where the detectives wont find it as easy. Most people are so used to it being so many traitors, thus forgetting about how the gamemode really is supposed to be played.
I used to play on a server where the t rate was 1/5, me and another guy was against 8 people, it forced us to try and kill as many as possible without being called out, and when we was called out we either had to act innocent and trick everyone or try and kill as many as possible to give our fellow traitors a chance. What I am saying is, let the ump stay as it is. (Not really sure if anything I said really supported this opinion >.<)