Correct Rolo, CX has very low memory and very low stretch since it is a fluorocarbon coated copolymer line. Not fluoro, not mono, not fluoro-coated mono, it is a copolymer which has completely different characteristics than any other line type. The fluoro coating helps with the low visibility underwater and the copolymer gives it a slightly smaller diameter.
Pline CX 15 lb = 0.34mm
Yo Zuri Hybrid Fluorocarbon = 0.405mm
Power Pro 15 lb braid = 0.007mm
Ande Mono 16 lb = 0.375mm
Most others in the 15 lb range are in the same 0.37 to 0.41mm range.
So 15 lb Pline CX is closer to the equivalent of 12 lb of most other lines, and 12 lb is in the 8-10 lb test range of others.