I don't think it's the difficulty adjustment that's the issue. Probability is really hard to predict with such a low amount of hashes per minute. I think that as miners are optimized and get quicker, that the coin will stabilize.
My CPU hashes QRK at 60,000,000 hashes per minute, with this it hashes 2.5, lol.
Just my thoughts.
K.
Actually you may be into something here. Many people that have received 0 coins after 10+ hours are gone, and there is no mining pool (because it's not a clone of another coin, so it takes time to open a pool). Few people are left mining. With the difficulty that high and very few hashes per minute we could find the next block in 5 minutes, or 5 days.