Hi emtheflem, welcome to the forums!
Your savings is currently being done by mortgage payoff, this is the reason why your progress appears slow. That being said, in a few months you will be able to put that $5400 to your TFSA, RRSPs, and investment accounts so I don't see any point to stop aggressively paying your mortgage now.
The biggest likely areas to cut down your expenses are cell phone, utilities, and insurance. You food bill is a bit on the high side, but not too bad if you have 5 people eating adult portions.
For cell phones, if you live in an area supported by Wind Mobile's network, you should consider moving to them. Your husband may be stuck with a national discount carrier like Virgin or Koodo if he travels for work. Virgin has a 300 min + 300MB plan for $40 with Canada wide talk, unlimited eve and weekends, and free texting. Wind gives unlimited talk and text for $25, with no data. For data add $10.
You should be able to knock down your utility bill as well by conserving light use, converting to LED bulbs, and keeping an eye on furnace use in the winter.
I'm not sure how your insurance is set up, but comparing to my bill I think you should be able to drop your insurance for cars and house to $200/month. Have you combined your policies under one carrier? Is your supp. life insurance a term policy? Did you shop around for life insurance and make sure you are not overinsured?