Miraclejj, for family sponsorship, I believe that the two-year ban is only for cases of misrepresentation. Nevertheless, it is good advice not to re-apply right away.
Lijunyu, it sounds like you have a Q1 visa. Not that CIC would recognize it as proof of a genuine relationship, it does show that the Chinese government recognizes you and the inviter (presumably your wife) as family. Spending as much time together with your wife is a good idea; one of the reasons that our application was refused was that the VO claimed that "the sponsor spent little time with you over the course of 4 years of your acquaintance", although we had shown that I had spent every day of my annual vacation with my wife and stepson. One consultant that i met with suggested that I take a 6-month leave from my job, but I couldn't afford that. But it sounds like you made the necessary sacrifices to be able to spend more time with your wife. A tip of the hat to you.
And definitely be there for the birth of your child, and the subsequent confinement period (坐月子).
I don't know if working under the table is a good option, though. You'd want to have documented proof that you are supporting your family , and they would certainly want to know the source of that income. Are you allowed to work on a Q1? There seems to be a big demand for English teachers, especially native English speakers. You might need a Type Z visa.
Your problem might not be as much in proving that you have a genuine relationship, as it is in proving that it wasn't entered into primarily for the purpose of gaining status. Unfortunately, you have given them a reason to think exactly that. How would one go about disproving that? How did you and your wife meet? Did she set out to exclusively meet a foreigner? Did she also go out with local guys?
I can't really give you much advice on a lawyer. But you only engaged your previous law firm for the judicial review, which tied their hands somewhat. The purpose of the judicial review wasn't to retry your case, or allow you to introduce new evidence. "You must show the Court that an error was made in the decision, or the decision was not fair or reasonable."
Several people in a Chinese forum had recommended this lawyer:
https://www.dentons.com/en/bill-cheung It doesn't look like immigration is his primary focus any more.
Then there's this lawyer, who uncovered systemic racism against Chinese applicants in the Canadian immigration system:
https://www.thestar.com/news/immigration/2015/05/19/immigration-guide-for-detecting-marriage-fraud-called-racist-and-offensive.html
If you are on QQ, come visit chat room 71793115. It's not as helpful as canadavisa.com, but it does show you that you are not alone, and gives you an outlet to vent a bit.