Those swivels are Garcia - the former company, and were mfg. in Germany, not sure who might mfg. a similar product now.
I tried the Pline CX (copolymer and made for low memory/spinning) this a.m. - my first use of a Flouro/copolymer - and it def is a big improvement in sensitivity and getting a light lure down, less stretch, etc and it cast very well.
That said, I heard on another site guys recommending:
P-line Cx 8# but the guys is wanting to try YoZuri hybrid 6#
If I did not have any mono, not sure I'd buy any now that I have tried the P-line CX this am, I may be a convert