CJ, just that little nugget about using the sides of the tip and how a knuckle hitting really hit home with me. I've been shooting on the table for the last 2 hours and wow. As I said before, if I get in dead stroke, I think I'm doing this automagically. The point was, I wasn't trying to do TOI as I probably need to watch your videos to really get it, but I was trying to use the edge of the tip on ALL shots just to try it. Just trying to play around you know. I think I'm starting to understand how those pesky 9 ball players get so much action on the ball. Since getting back into playing, I've struggled with actually getting my dang CB to actually stop dead. Hitting center ball with the top of my tip stops it dead. It gives a clear target and a smaller contact area. If we pretend the tip and the CB are both metal/glass spheres, there should be a pinpoint contact area. This is forcing the pinpoint where you can easily judge where it is, instead of hidden in a 12.5mm diameter where you might be off in up, down, left, right or combinations of them, not to mention it might be flatter.
I've always thought a cue should be held super lightly, but I did notice I was naturally holding it tighter, not a death grip or anything, but basically at the point of contact. Like you said, like a hammer when you pop the nail, or like an axe when you contact the log. You're muscles are loose but at that moment of contact they contract just a bit.
I've honestly never really trusted the dead level cue idea because I know when I'm in stroke, it's never level and never hitting the center of my tip. As soon as I started thinking I might be getting a little wild, I try to go back to "basics" with a dead level stroke. This usually results in me going out of stroke and sucking until I forget this "cornerstone" knowledge and let my stroke out a little more. I just knew I must be wrong because all the instructors say dead level stroke. I should have trusted what worked for me on the table.

Using the edge of the tip just makes sense.