That is the same line I use for a lot of my set ups, anywhere from 10-17 lb and absolutely love it, but to answer your question...
1. 10 lb for jerkbaits most of the time (especially in the spring when the water is cold)
2. I don't use a specific type of backing, just whatever was left in the spool (co Polly is cheap enough as it is)
3. I usually use a palomar knot or an improved clinch knot