The oil leak at the sway bar/structural collar area and drain plug seemed to have stopped.
It was the drain plug the whole time. I was brave and gave 2 more quarter turns on the drain plug and it actually snugged up and sealed...
Glad to hear it sealed.
Possibly whoever put that plug in didn't force it those last parts of a turn to form the threads that far.
What I did when I used those before is the first time putting the OS plug in, I removed the washer, then turned the plug in until the underside of the head contacted the pan land area. Then removed the plug, and put the washer back on. That way you guarantee forming the new threads slightly beyond what's needed, which will guarantee seating/compressing the washer without the threads not being cut quite far enough causing you to think you've got the washer compressed when really you're just feeling the resistance of the thread not being cut that far.
So if I'm right, you didn't really add stress to the threads that could have stripped them - you were just forming the threads in a little farther. But still, it can be difficult to tell the difference between torque forming the threads vs. torque clamping against the washer.
Next time you change the earl, you might want to go ahead and do that (remove the washer, seat the plug, remove the plug, re-install the washer) so there's no question you've eliminated the thread-forming part of the equation as you tighten down.
Again, for however long you'll be using the OS plug, avoid applying much more torque beyond what it takes to seal because the OS threads are slightly weaker than the original threads (not formed/cut as completely), and we all know the originals didn't last forever.
Even if you replace the pan with new, you'll always have to be aware that if you take it to a shop for an oil change, some over-zealous wrench monkey can strip a perfectly good thread if he uses an impact wrench or oversize-length hand wrench (which some shops do have and use). Not unheard of that happening, and rather than telling you, they just hand tighten the plug with the stripped threads in the pan - maybe put a little RTV or grease on it. It will leak, but it will be a few days before you notice. Or you might not notice, then the next guy who changes the oil gets the blame (or you do it yourself and think you did it).