How much difference is there between a line like Yozuri Hybrid and a 100% fluourocarbon? I've seen and read all about the similar stretch but, what about sensitivity? Is 100% that much more sensitive (double or better the price more) that any of the copolymer lines?

100% fluoro is more sensitive. There is no questioning that. It is a much denser line. With that being said, Yo-Zuri is still plenty sensitive enough to use for bottom bouncing techniques. If fluoro was a 10, Hybrid would probably be a very strong 7 or an 8.

Sensitivity is not a function of stretch alone. If the line floats (eg braid), most/all of the sensitivity is lost if there's a huge bow in the line, even if the line is low-stretch. For tight line techniques, once again, there's probably a difference in sensitivity between mono, fluoro and braid, technically speaking. But it the line is tight, feeling the bite isn't usually the problem, for me anyway. Hooksetting might be...