I stipple with metallics quite a lot. It's no different than stippling with any other thread other than I go a bit slower.
BUT you do need to use good quality thread (I like Superior) and either a Metallic or Topstitch needleusually in a 90/14. These needles have a larger eye and the Metallic one has a special coating to help prevent fraying. I find that my top tension has to be a bit looser too.
If you're using good quality thread and the correct needle, I think your top tension was too tight for the thread - I've had this before.
Good luck.