You have had great help on this post already and agree with most all of it. The way you know when a fish has taken it while falling may not be completely explained in writing, or even in person. I make a medium cast and try for a slow fall with a belly in the line but no slack or tension. After a few casts I can determine what it feels like and how long it takes to reach bottom. Yes, watch the line with concentration, but don't be tense or stiff. Many times it can't be explained why you set the hook, but 80% of the time when I do set the hook, there was a reason for it,even if I can't tell you what it was. The hookset is gentle so if nothing is there so what? As said most of the time when the brain says one has put it in its mouth, it really is happening.
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