Do Not Nerf Shotgun/Cloak, Buff other EGO Abilities and Weapons
PVP. First of all, if you nerf Cloak, everyone will switch to blur and use closeup shotgun attacks in a similar way.
But my main point is buffing something like overcharged shot will allow people to use something other than cloak/shotgun cloak. Also, buff the AR/LMG/Sniper rifle. The players who actually aim their shot and use some strategy will be rewarded for doing so.
I play a lot of PVP and use a cloak/AR combo. I tried Overcharge shot, but it does only a little bit of damage extra when using an AR. It really shows when the infectors hit you, can't see what you are shooting, it's a loss almost every time. If I use cloak, I can at least get a few shots off on infectors before they blind me with there infections and bugs. A mor epowerful overcharged shot should kill them after a few shots, especially when I'm shooting blindly and they are bunny hopping.
I also think kepeing some shotgun/cloaks around will keep the games moving fast. I would not take them out of play, just add other viable builds other than sniping infectors.