Some stinky diharrea poo is normal, it is called cecal poo assuming they produce normal droppings as well they are not sick. Also some feeds seem to create stinky poo, so if you have to brood in the house all winter you might try a different brand.
I clean early and clean often, this has the additional plus of not only reducing smell, but decreases that greasy, dusty dander that so many of us are allergic to, as well.
I also found that I need to keep anything cleaned up in closed (tied shut) garbage bags, since that smell can realy travel.
Different people have different sensitivitities, many people seem to not be bothered at all by the odour of chickens. However, if you are one of those that is, I urge you to deal with the problem by simply cleaning as often as necessary to eliminate it. Life is too short to spend it being annoyed by the things we love.