so it is the oil pan or rear main seal
How much is leaking? Like puddle on the ground or just seepage?
Over the years I have found with oil leaks to follow them up as high as they go and that is usually the source
Unless the fan is blowing it to other places
Rear main seals on these engines will always be "wet" with some seepage, dang near impossible to get rid of all of it
Many times when gaskets are replaced, leaks are just slowed down....meaning it is all about proper preparation and installation to get a 100% seal, if the surfaces are not clean enough (dry free from oils!) or have imperfections the gasket is not prepped or seated just right = more leaks. If the metal has imperfections then a sealant should be used like silicon to make up for the gaps the gasket cannot reach.
Follow the instructions on the tubes, let silicon setup before putting the pieces into service per the instructions that came with whatever gasket maker or sealant you are using.
On the rear main seals I learned long ago to use a light coat of aerobic sealant on the block to seal side of things, then lube the seal and crank (vaseline or assembly lube) and they will hold....for a while, when the engine gets higher miles as I said, seepage is normal
drips not normal
puddles need attention soon
Good luck!
If you have to do the O ring 2-3 times in the oil filter bracket you can coat both sides of the O ring with some RTV just a light skim coat is all it needs to finally have a dry bracket! Cologne, 4.0, 60 degree v6 engines are a PITA when it comes to oil leaks
Hang in there