I'm a little confused by your post.
At the top you say that you jump the pressure switch and nothing happens, then later you say that you hot wire the compressor and it works fine.
By hotwiring, do you mean you jump voltage directly from the battery? If you jump voltage directly around ALL circuitry and the compressor comes on that only says that there is something somewhere in the circuit that is not putting voltage to the clutch.
Secondly, you keep saying that you KNOW the system is charged, but I'm still not clear why you think that. Have you put gauges on the system?