The undersides of the leaves look fine. I didn't put it outside or change the lighting. If I was burning the leaves by having the plant too close to the light, I imagine the top leaves would burn, not two of the bottom ones. It is possible that the soil that I used to fill the bucket wasn't the exact type that I used in the small clay pot, but it is good soil—my Trinidad Moruga Scorpion is thriving in that same soil. I'm following the same fertilizer regimen (1/4 strength nutes every other watering) that I have been using.
My only suspicions are over-watering and/or bad drainage. On Wednesday, when I transplanted it, I planned on soaking it until water came out of the bottom holes, but after A LOT (I think around 8 cups) it still didn't drain, so I gave up, thinking more water would harm it. Not sure what the drainage issue is—like my scorp in the same type of bucket, 4 holes have been drilled in the bottom, and I have some rocks at the bottom.