Quilting on a Tajima

Hello!!
My boss has made a quilt top and wants to quilt it on our Tajima single head. I am having a heck of a time with this!
Has anyone done this before?

The issue I am having I believe is with the bobbin and the thread. Using a metal bobbin and it slips around inside the metal bobbin case. I've done a bit of research and bobbin clips seem to be the solution. Don't have any of those. Any other suggestions?

I've attached pictures of the top and bottom of the quilt on the third attempt. Same embroidery thread on the top and bottom.

I do have cotton quilting thread but it still slips around in the bobbin case.

Any suggestions and or help would be appreciated!!

Much thanks from a frustrated employee.