So I finally had a chance to get her up in the air today, and I can confirm that the leak is coming from between the sandwich plate and the OEM oil cooler. I went to swap out orings and the one I ended up taking out has a big gouge on it side that rolls into the edge. I replaced the oring, put on my oil cooler block off cover and installed the tee for my Defi oil pressure sensor while I had her up. I wanted to add a tee for the temperature as well, but the threads for the OEM oil temperature probe are not 1/8bspt (the ressure switch is) so I couldn't use my other tee that I bought
I'll add some pics when I get home