You realize in this case your 80 hours would still get you just 55k a year since this is talking about salaried employees only.
I understand. But working one job makes it easy to do taxes, because you just file and get the refund, whatever it is worth.
However, in Canada, you almost have to have the second job submit 100% of your pay in taxes if you are going to get a refund at all and to ensure you dont underpay.