marg1, you are correct in thinking you are not subject to the EI Clawback. As you can see from the following link, it only affects people who are above the net income threshold. In 2017, that threshold is, as you noted, $64,125. This threshold tends to increase a little each year, normally dependant on the inflation rate.
https://www.canada.ca/en/employment-social-development/programs/ei/ei-list/reports/repayment.html
