Where is my oil leak coming from? on 1996 Chrysler Sebring

I had a small leak coming from the engine on the passenger side of the engine, 2.5V6, so I changed the valve cover gaskets. The leak got worse. I changed the gasket again, and it still leaks, now worse than originally. I can see it leaking down the rear of the engine but I can't see or feel where the leak is coming from.
Any ideas from anyone would be really appreciated.

Asked by for the 1996 Chrysler Sebring
sounds like it might be the intake manifold gasket or worst case head gasket.