I use Varivas ES2 Lemoni polyester line in 2.3# test. Varivas also makes Hi-Vis nylon and FC lines also. As to soaking lines in water...while it will relax a line when you first soak it as soon as it drys out it goes back to what it was. And if you live where you have hard water those minerals will stay in the line. I just left a place in TN with extremely hard water. Nice to be in Arkansas that has some of the softest water in the country. If one has to soak their line to get it to spool properly then you are using the wrong line. I don't have line issues...none....so I suggest to those having line issues just to get a premium line.
Regards