Hi, precomping to increase contrast is a good idea. In the colour corrected precomp you can also use median and blur to reduce chatter. Also animating a levels effect in the precomp might help you deal with the darkening at either end. Make sure you have your footage interpreted correctly. This footage is Upper field first (I think). Make sure to check preserve edges. If a point is chattering, you can track another nearby point and average them with an expression (point1 + point2) /2. Don’t stabilize scale.
I did’t do all this stuff in the comp I sent, but my track points seemed to work OK.
Pete O’Connell