MTI seems to be there all the time. Over the past day I've heard it centering anywhere from 13555.5 to 13556.7.
I don't know if it's really moving around or just some weird propagation or receiver peculiarities.
Earlier this morning there was a strong pulser plus a random ditter in that area. I think there was one on about 13550, but the pulser pretty much drowned it out.