If you have a rod and reel dedicated to float fishing I would highly recommend using a super thin braided line over monofilament.I have been using 30# Power Pro for the last few years for float fishing for salmon and steelies and have had great success with it.The line has less than 3% stretch factor,so when you swing on fish that hook gets buried.It also lets you run a lighter,longer rod for protecting light leaders but allows you to use largers hooks and still get great penetration on the hookset.Another great attribute is that the line floats on the surface so that you can actually mend the line as you would a flyline for great line control.All these factors help in landing more fish when float fishing.Hope this helps.