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My new house, a stick built, has 3 vents coming out of the roof for the drains.
Try putting a trap in the drain line leading to the septic. A trap will prevent gases from coming back into the house from septic tank.
I am not sure if this will help, but do you have a pipe from top of the roof leading to your main septic pipe. This pipe allows for better waterflow and removal of build up gases. This pipe should be positioned out to the roof and not in the attic. This was an issue with one of my friend who bought a condo.
The attic smell on the second floor, you may want to check for dampness.
Hope this helps