I always notice cable break in but it varies quite a bit. Generally speaking, most high end people say that its the dielectric material that breaks in or polarizes. If that's the case, your cables should burn in quickly. I'm not an expert, but personally, I've always felt that the conductors break in, as well. I admit that I'm guessing and I could very well be wrong.
With question 2, what are you comparing it to? Are your old cables stranded?
With question 2, what are you comparing it to? Are your old cables stranded?