Just dropping my 2 cent. It looks like the officer is not satisfied with all of your acquired canadian experience. Also you are pretty tight on your canadian experince, that sits around 25 months. Since you worked part time you will required minimum of 24 months of work experience if you worked 15 hrs. Also for T4 the officer can only get an estimation of your total worked hours with no way of knowing whether you worked less or more than 15 hrs in a given week. Your paystubs would easily provide a better picture.