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.