My theory is, there are two kinds of strokes (I am using two kinds of strokes, depending on what I need). One with the short tip contact you measured on the video. For this one there is no difference between the different tips for the english applied.
The other stroke is one where you are accelerating with your cue contacting the CB. The first one is very constant in reproducing (its just about, where you hit the CB, same english every time, even with different tips, as shown in your video), so its great for position play (you know exactly, how your CB will travel). But there are limits to this stroke (you are in my theory not able to draw the ball 15 diamonds with this stroke). So for extreme english (extreme draw for example) you'll need the accelerating stroke on CB contact.
A nice follow through is then the ability to accelerate through the CB. And because the contact time is so short with very hard tip, this accelerating stroke doesn't work (or is very tough to produce) with phenolic tip.
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This would be anouther example for extreme english that probably won't work with phenolic tip. I'd expect with phenolic tip the CB to jump while soft tip will enable extreme english to get the desired curve.
I suspect that would be tough, and maybe even impossible with a phenolic tip, but I will try. A masse cue is very different from a break cue with a phenolic tip, for several reasons.