In the two accepted examples, the runway is lower than in the rejected pic, and I do think the rejected pic looks unbalanced.
When you cut the tail, that should be done for a reason, ie the plane should fill most of the picture.
In your accepted examples, the whole fin would not fit in the frame even when the a/c was lower in the frame, while in the rejected pic it might fit. This is not a rule or something, but I think it goes some way in explaining what's wrong.
This is, in any case, a completely wrong way of looking at the problem, in my opinion. Measuring this or that distance gets you nowhere. The problem is that your subject is not a rectangular shape, it's an L shape. Even when you crop half the fin out, you can't simply ignore the fact that there's such a thing on most aircraft (a huge fin even in the case of the 737-600).