If you are using metallic thread on a spool, the thread has to be delivered from the side of the spool. If it is on a cone, or cross wound, it needs to be delivered off the top. That way you won't have extra twists in it. Did you know the metallic needle and the topstitch needle are identical? Well, they are. We contacted the large needle companies and they confirmed it. So, proper needle (90/14 for home machines or #19 for longarm machines), loosen the tension and proper bobbin tension will do the trick.
Ricci