So you are taking advice from the same people you accuse of having a conflict of interest? What is wrong with this picture?
You need to find someone to solve your problem who has no conflict of interest.
Again, I think you would get more out of this discussion if you posted the actual numbers form your emissions tests. I won’t know what to do with them, but there are other regulars who will know why certain numbers are out of line, and can give you better ideas about solving your problem.