Rebecca, table format will not make a difference tbh, infact i would say it will be nice an structured. IRCC is looking for information rather than cosmetic aspects on the letter....Thanks a lot. That s good to hear. The letter does cover that info. It is only the format of the letter that concerns me as it is made in a table format listing out all the positions I held from time to time. Detailed job duties though not vary much are still listed following each position. Again, nicely in a table but I am worried that CIC may find it... not formal enough. I do not think this would be a problem as as long as I am able to prove that by including my latest 6 months pay stub and the social insurance book from 2014 till 2017 (4 years of paying social insurance from the same company and different titles).
Check this guy's post: https://www.quora.com/What-is-the-purpose-and-the-format-of-a-Reference-Letter-to-apply-for-a-Canada-PR-after-getting-the-invitation.
last 6 months pay stubs are fine to attach, no need to attach social insurance book.
as mentioned above include your offer/employment letter as well if you have that.