Mike, can I recommend that you check the oil immediately after shutdown, before the cooler has had a chance to drain back? I used to do that in mine when it was wet sump, there is almost 2 quarts in my cooler and lines.
Gordon: you can see the nut in the case behind the "umbrella" of the pickup tube. But you can't tighten it with the case halves together unless you dent it(yes I dented mine). I did this last summer when I went dry sump. I had to replace the sump studs with longer ones, so they all had to come out. The longer studs were to affix the dry sump suction cover to the bottom of the case.
Some guys put bolts up through the case(bolt heads on the inside) so "studs" can't unscrew or strip the soft case. These studs require VERY little torque to seal with NEW copper sealing washers, and use cap nuts for no leaks. I got mine from our favorite Bug City.