I don't reccomended emptying a crop or using garlic on a chicken, both are a good way to kill them.
Where did you read that the smell could be sour crop?
Heat plates are too cool to bring chilly shipped chicks up to heat quickly, I'd start with a light then switch to a plate if necessary.
Most hatcheries reccomended heat lamps for the first 48 hours.
Once a week, if at all. Most of those thing are either neutral or bad for them.
Oatmeal, rice, grits are nutritionally low, especially rice and grits. Meal worms are high in fat and the herbs and spices are not going to give any benefits and can be bad for them.