It is apparent that is largely because of the new words in the new domain. For long me and some colleagues have debated which are more attractive to search engines: short domains with the .com, or phrase-like domains with any extension. What we're seeing is that "good" phrase-like domains (with any extension) relative to your product get more search engine display; although, the viewer's ability to make a mental note of your domain and return to it is diminished. So the question is, do you want your domain to keep popping up but hard to remember; or do you want it to pop up less, but easier to remember?
I propose a "bookmark-us" link on the first page of phrasal domains. I disagree with a user that Google gives advantage to new websites -- to the very contrary! And for those who still doubt, hyphenated domains are, indeed, a disadvantage.
Any weirdly worded domain, like "ztx0fw.me", can have a strong search engine frequency if branded well enough; though, branding a domain is expensive and time consuming. A good place to test the weight of the wording of your domain before you purchase it is the domain appraisal web interface at GoDaddy; we've noticed that it focuses more on the popularity of the words -- a higher amount is indicative of the frequency/popularity of the combined words. Here is a tip: The term "face" combined with another short practical word seems to output good frequencies; same can be said for: book, game, and mobile.
In any event, I'm glad your new domain is doing so well. Congrats!