Hello Tushar,
Looks like you are really desparate, first of all relax...
I was going through exactly the same situation earlier and I changed employers after around 180 days plus 3 weeks. It was not that I wanted to change, but the circumstances were such that it was either that or I may be without job, possibly.
In fact after changing, the salary that I was being paid , is more than that what I was being paid at that time by my consulting company.
That said, it's still a couple of thousand dollars less than what is mentioned on my I-485 letter of employment/Labor. This can be a problem (?). And incidentally I have still not informed about my job change to INS. Hope they don't find out and hope I don't get an RFE
I did not move to a new place, because I was required to send AR-11 and there u have to mention ur employer's name, which would be different and could raise a flag.
What I thought that time, was that the job is more important, rather than GC. If I don't have a job, then what will I do getting a GC. And I took the new employment. What I am saying, the decision that you have to take is yours and yours alone. Weigh your priorities and take a calculated risk/gamble (?).
As far as I am concerned, in case you are making above the threshhold minimum (around 15K-20K) for a family of 4, then you should be fine. If INS refuses, then fight them, I am willing to fight in my case. Of course I pray to God that GC is not refused because of that.
Hope this helps... Good Luck in everything you do...