I'm in Europe and the latency is always constant at 114, it strikes me that I have less latency in other pools in the US, honestly, I've been in ckpool for a while and it gives me a lot of confidence and since this is a lottery, if a block arrives welcome be!!.
How do you know your miner is connecting to a server in the U.S when you use other pools? It could be connecting to EU server since most pools have one there, besides the U.S is rather large, servers located in the east side of the country will have lower ping time than those in the west (as far as EU and Africa is concerned).
That p.s many other technical reasons that could affect your ping results, 114 is pretty decent, way better than my average for sure, don't worry at all, keep mining.