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Did you try Jack Stephan Plumbing? Let us know if they was the plumbing contractor that did your work.
Smoke testing is relatively easy to do and consists of blowing air by method of a leaf blower and either a 90 second emitter or 3 minute emitter.
Drop this smoke emitter in a wire looped hanger and allow the bomb to smoke inside the pipe. You then point the blower in the direction of the house from the outside and have others check indoors for signs of a leak.
Replacing the wax rings on the toilets might be a good first start for process of elimination of this smell.
