I hope some senior replies to you. I personally think that your application would be evaluated by what you reference letters you have submitted. Since none of your personal details have changed e.g. name, marital status, address, etc, you are not required to tell the CIC anything. I think that your job does not matter. Even if you were to be fired, it would be OK, as long as the company is ready to back up the details in your job reference letter.
Generally you get MR a month after PER, but this depends from VO to VO.