OK, note in the photo of my modified cap, I have fitted a return pipe? If you look at your cap, you'll notice the return hole for the oil is threaded...a very fine thread. Thing is, and particularly with a high volume pump, that crankshaft windage, in looking for paths to escape, will use that threaded drain hole and blow out through that labyrinth, taking oil with it. So, if you make and fit a pipe into that threaded hole, with the other end of the pipe long enough to be continually immersed in the oil in the pan, the oil coming through the rear main can return to the oil pan, and the windage escape route in that area is reduced.
Ford actually supplied such a return pipe in some engines. Here is one currently listed on eBay;
https://www.ebay.com/itm/113767951221
I have no affiliation with the seller.