What you need to do is straighten out the needle; it coils up from being that way in the package. Dip the cord only in very very hot water for a minute or two. Then let it cool off while you putll it straight. That should get most of the kinks out of it and after you knit with it a bit, the weight of the knitting will help too.
You don't have to keep the stitches tight on a circ, the cord is much smaller than the ends and that's okay, it's just a stitch holder. The tips are what determine the size of the stitches, don't worry about them after you've knit them.