One thing that I've noticed about metallic thread is that it breaks and unravels easily. When I use it now, I slow my machine down. The thread seems to hold up better on a slow speed.
I'm not sure what brand I have, but I got it at Hobby Lobby, so it's probably not the best one out there.

make sure you use a needle designed for metallic thread. They have a bigger eye, I think that eliminates fraying and breaking as there is less friction.

I have used a lot of metallic thread and find I don't have a problem when I slow down and I always use a metafil needle ( made for metallics) Most of my metallic thread is Guterman and Sulkey Sliver The Sliver thread is really sparkley but I love them both! Just got one from Superior Threads but haven't used it yet. Hope this helps

The best info for metallic thread is here:

http://www.superiorthreads.com/videos/chapter1/

I prefer to use a matching cotton thread in the bobbin, instead of the mettalic too.

The best metalic thread I've ever worked with is made by Robinson-Anton. I just finished some embroidery with it and it was perfect. I am careful to chose a design that the stitching does not over lap much. Satin stitching can cause more breakage. I also use a metalic needle.

I use a neutral in the bobbin. I think I remember your quilt having a lot of black so a black in the bobbin would work well (70 wt). A metalfil needle is a must. I've had really good luck with Sulky. I'll check on the others. You do need to be careful on cheap metallic thread out there. Some is very brittle. Definitely slow down to reduce shredding. You might want to make a "scrap" sandwich and test drive a little to make sure you have the right feel. I occasionally find some metallics feed better off an upright spool holder (my normal is vertical). If you have a lot of trouble with curl on your thread you can take it off the machine and put it in a jar next to the machine to give it a longer length to relax a little. I've even seen ladies repurpose spice bottles with the holes at the top to help with this.

I'll echo what's been said - good quality thread like Sulky or Superior, Metafil or Metallica needle, slow down, and you might have to loosen the tension a bit.

Another option if you have trouble with metallic thread is one of the trilobal polyesters in a color that looks like silver. I've used some called Metrosene and another Poly-X. It's shiny although not metallic, but I find it runs with fewer problems.