I did run a bit of math for the Dwarven Throwers.
Assuming you can send in the clowns and a PC is the clown coordinator:
Attempting Athletics (+10), Athletics (+5), Athletics (+0) gives you on
average a 1.85 net excitement gain.
Attempting Acrobatics (+7), Athletics (+5), Athletics (+0) gives you on average a 1.93 net excitement gain.
So you are better off using your skill with the lower bonus for the first check of the trick.
Not very intuitive for the players!
If you cannot send in the clown, then it doesn't make a difference. (You will get 0.9 net excitement on average)
Really old, I know, but how is using a lower modifier check ever a good idea? I'm not geting how using the +7 ends up with a higher success chance than the +10. Is there some verbiage I'm missing that is being used as the basis for this?