I just replaced a ton of stuff on my rear hatch in order to eliminate the leaking: spoiler gaskets, rear wiper gasket, all four trim pieces around the window. When I removed the trim I also added more weatherstripping adhesive for good measure although I couldn't see an entry point. For me, the rear wiper and spoiler gaskets didn't fix much of anything. One area that was contributing to my leaking was the lower window trim. The trim is held on by 4 bolts with small foam washers around them. When i removed my old trim the washers were compressed to the point of being practically useless. I theorized that was my water entry point since it looks like a great place for water to pool. Water runs down the window, seeps in the gap between the glass and lower trim, and runs down the holes where the bolts pass through the metal and into the plastic interior trim cover. It looks like you could carefully remove that trim piece and replace the foam gaskets with new ones, rubber ones, or maybe even silicone although that may make future trim removal a bit more difficult. I'd say that if you have tried everything else, then examine that lower trim piece.
Pablo94sc, you may have a leak from the right rear spoiler trim (the one that attaches to the body above the fuel door). IIRC, it's held on by three connectors and I'd imagine if the rubber gasket is old water may be seeping in between there.