"I sold some NRN this week. I'm trying to become a more disciplined investor, locking in some profits. It still hurts, though."

Probably a very good idea. This stock has gone up on very low volume. That's easy to do if someone wants to create a "leak" momentum in a stock which was relatively dormant. There may well be a leak or there may be a few selling shares into a small number of "inspired" motivated buyers. Wouldn't be the first time. Your DD sounds like you're into something with some potential though.