Well you are right , same thing happened to me when i was BETA testing the TF2 mod...well Anyways, I think its better when you trap a ghost, they become a model, Like something that calls attention so you can go there and kill them. Also, try making a wep with a Thermal Sight and remove coldblooded from Ghosts...who knows ???
PS: How often does the click sound happen? every sec? every 5???
When you trap, they show up as ghillie suits, which is most suitable for ghosts.
Making them bulletproof just wasn't a great succes so I won't reimplement it.
And thermal doesn't work when invisible.
The click happens every two seconds if I'm not mistaking.