@Alex-Jurkiewicz most of the questions you should ask TrainAsOne.
I use TrainAsOne as well, but I don’t get what you mean with the black gap that moves around - do you happen to have a photo by chance?
The pace vibrations you get when you are too low, too high and when you cross the borders to “just right”. And I think there is even a vibration when you exactly hit the pace requested. Yeah, it’s annoying as it is too much, but it cannot be disabled at the moment.
The tightness of the guidance can only be influence by TrainAsOne.
Currently neither the Suunto App now the Watch can display those guides, sadly. That is a well requested feature to see the workout that you are about to do before you do it…