As you said, it's likely just the signal getting better. I think this is only the second non-utility broadcast I've ever heard between 8 and 9 MHz, the other being Radio Casa in Brazil on 8000. (That includes the late 1970s through the 1980s though there may have been a random Peruvian in there.) Dreadlock Holiday is one of my favorites, by the way! (And then another of my faves, Wurthering Heights by Kate Bush.)