I had the same oil pan and windage tray. With .003 clearance on rods and mains. As I was turning onto return road oil pressure dropped to 10 lbs. The next pass spun two bearings, windowed both sides of the block. I did high tech testing with same pan and windage tray. Strapped oil pan with 7 quarts of water on front of my quad on concrete. Launched it, dang that water was cold! What water didn't come out on launch. Came out when I braked. I fabbed two baffles with BMW style rubber flaps. And welded in covers on both ends of windage tray. Then did the same test, hardly lost any water. It is worth the time and trouble to trap that oil where you need it. Oil drain back is fine too. Have you taken the motor apart yet?