Can you share photos of your brooder?
Also photos of your coop?
The main things in re: odor in the coop are:
SPACE -- The usual recommendation of 4 square feet per hen is a minimum. Crowded chickens will stink.
KEEP IT DRY -- Good construction, good drainage, and appropriate bedding. Poop +...
:goodpost:
I put my waterer up on a block on top of a tote lid to keep spills out of the bedding.
Also, my brooder is both outdoors and over-sized: https://www.backyardchickens.com/articles/run-to-outdoor-brooder-conversion.76634/