Thanks Donna. I thought it about it, but decided to try the ink again before getting rid of it. This time I had no smudging, even just a couple minutes after stamping. Go figure.
Maybe I used too much ink the first couple of tries. A Muse is a pigment ink and I think it sits on the paper surface rather than soaking in like dye ink ... but I could be wrong. I'm going to try it a few more times before making up my mind.