Great quilt design and I'm really happy things are flowing smoothly for you! I can use C & C on my Singer, but not my Bernina. It has too much lint for the Bernina, but then so do lots of the other "good" threads. You just need to experiment and find what works well for you. Good luck! Post those pics!
Oops, went back and realized that I didn't answer your question. If the thread says "quilting" I would not use it for piecing. It seems to me that it would be thicker than regular thread...and besides..I'd use a thinner thread for piecing (you can get more on a bobbin and it would be cheaper)