Yep have to agree. Have tried it and it does make a difference to the shot. Have made the same mistake with the second image. One of the rules of landscapes is not to have horizons centralised, but on one of the thirds lines. Thanks for your input 
I can no longer see your shots.
The rule of thirds is a good guideline but I have seen many shots that defies them and still give a good shot. Centralised horizons do have the potential to be disturbing but then again, not always. Composition has mostly to do with the mechanics of our eyes and following certain guidelines usually get a result that is pleasing to most. In your shot the problem for me was that the top edge contained a stray element that was not really adding anything to the shot. This I say from memory

This shot is a good shot but can be better by cropping the bottom. Not to move the horizon but to avoid the "void" in the right bottom corner. Cropping it now will help a bit but it could have been composed better in camera.
PS ... No malice intended and if my comments are disturbingthe peace I will remove it.
