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I'm interested in the answers from engine builders, because my Aviaid pan has always leaked. It was worse in the past, than now.
Early on I contributed to leaks by over-torqueing the pan bolts. The tighter I twisted the bolts, the greater the tendency to leak. Excessive tightening distorts the pan's flange around the bolt hole.
Years ago I had the pan off for some reason and noticed the distortion at the bolt holes. I flattened those areas before re-installing the pan.
I use a pair of cork gaskets, and NOW tighten to about 5-7 pound feet of torque. That's not much. Instead of bolts, I use studs and flanged nuts. I still get some drips.
David
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