I am not an expert, but what i suggest is to submit employment letter along with noc code and stuff with latest paystubs through their ircc web form (CSE). Ask few experts too and dont rely on my answer alone.I have designation, work hours, salary mentioned but not the work duties or NOC. If there is a problem with it and they feel the information is insufficient, will they give a notification for the same or they would make a decision with explanation. I can redo the letter with work duties and NOC but I am not sure if that is wise enough. The application is 11 weeks old now.