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You have an interesting issue with this one replacing the pan gasket is a good place to start. Since its only leaking when underway and under a load my first thought is the Turbo oil lines, if you just sitting running the engine your building no pressure hence no leaks. The amount of oil you talking about is way to much for anything that would normally come out of the slobber tube and your oil seems to be getting much higher than the bottom of that tube anyway, but just to help isolate things I would attach an extension to that tube just to eliminate it. Now here is another thought, I do not know what that piece of material you found when you dropped the pan is but lots of very smart folks here who will likely know what it is. I dont know this but it could be something that is causing lots of blow by in the engine and that excess blow by could be coming from your slobber tube hence the extension on it. I am very interested to see what you found in the pan, it might be something and it might not, trust I am tuned in to see and good luck!
Karl
Karl