Have you noticed the guy with all the equipment standing about ten feet from you everywhere that you go? You have? Good, so now that you are aware that he exists, you should also know that he is called the cameraman. That's right! He's got a camera! Focused on you! Ten feet away!
I tell you this because you seem to be confused. You are not in a theatre production. That means that you do not have to OVER-EMOTE for every. single. reaction shot when those grim little (well, Vern is little, but the other two are regular size) judges explain the challenges or, indeed, tell you any little thing.
You see, Tom, that cameraman is, I repeat, ten feet away. You do not need to OVER-EMOTE as though you are trying to convince a nearsighted elderly couple sitting at the back of the second balcony that you are having an authentic reaction. What with all that fancy technology, the cameraman picks up every one of your annoying reactions (and all that huffing and puffing) just fine.
You see, there is just no reason for you to act as though you are that excited or astounded or whatever over-emotion you are trying to communicate every single time one of the judges says anything at all. And if it is not an act, if you really are that excited or astounded or whatever, then I fear that hosting your own show would be even scarier television than you have demonstrated as a bit player in this train wreck of a season.
I'll huff and I'll puff and I'll decorate your house up!
*exaggerated head tilt*