I have used both the Monofilamet and metalic for years.
With the monofilament its all about the tension. Almost every brand ...I have to take the top tension way down. I also use a smaller needle , because the thread is very fine. I have used mono on the top with quilting weight in the bobbin and nice results. I do use a thread stand for the mono thread.
With Metalic thread its all about the needle , and a bit of tension adjustment. Do use a metalic needle and use a thread stand this helps the tension prior to going through the tension disks on the machine. I do find I need to work a bit slower/steady with metalic.
Great Info is on the Superior Thread web site. They have a whole video just about metalic thread. I have the best success with their metalic thread.
I do not typically use metalic in the bobbin, but do experiment on a sample piece with the exact fabrics and batting to get all of the little adjustments before starting on you project.