If you have so many pauses that you feel the need to vary how you describe them, chances are that the reason it feels repetitive is that you are reaching for the same device too many times, not that you are always describing it the same way.
The reason could be that you have fallen into the trap of TV writing -- writing a scene as you imagine it would be acted on TV. But this never works. The screen is a synchronous medium. A scene happens in real time and there are usually several things going on at once -- one actor is reacting while another is speaking while other things are happening in the background. A pause is a dramatic device that an actor can use to good effect because it takes real time on screen. The viewer has to wait on the pause (though they may have other stuff to look at while it goes on).
A book, by contrast, is asynchronous. A scene unfolds at the pace that the reader reads, not the pace that the action occurs, and if there are multiple things going on simultaneously, the reader reads them one by one out of time sequence. A pause is generally not dramatic because it takes no more time than it takes to read the words. There may be times when it is appropriate to say that a character paused, but if you go to that well very often it is just going to sound repetitive and eventually silly, because it simply does not have the effect in a book that it has on the screen.
Book storytelling is not screen storytelling written down. It is a very different art form with very different strengths and weaknesses. Things like pause, which take up actual time, have a high impact in a synchronous media. They are weak in an asynchronous media. There are other ways to show hesitation on the page -- you can show it in non-committal or evasive speech for instance. You should use the tools that your chosen medium provides.
Don't expect that finding different ways to phrase things that are not working is suddenly going to make them work. The magic is not in the phrasing, but in the correct juxtaposition of story elements. The correct juxtaposition of story elements to achieve a specific effect is different between media. You have to use the right storytelling techniques for the media you are working in.