You may not think you are applying power unevenly or that your timing is the issue but I will bet you a dollar to your dime that they both are part of the problem.
Take a look at the first video in the explanation below. It shows the rod acting as a simple lever without the compensating convex movement of the rod stroke for the concave rod tip path as the rod shortens during the flex.
Secondly, the author describes rod creep which is is the forward creep of the rod hand before the line straightens. He calls it a common cause and I say it is especially common when attempting longer casts.
Creep is a timing problem of when to start the cast. It both starts the cast too early and shortens the available stroke path so more power has to be applied in a shorter than normal distance causing uneven power application and/or the power applied at the wrong time in the cast which is another timing problem.
Tailing Loops - description and cure
Tailing Loops 2 - description and analysis