This is an interesting article published in MoneySense last year that suggest paying down your mortgage may be more beneficial than contributing to your RRSP due to the guaranteed nature of the return you get from paying down your mortgage. In trying to find that article, I also found
this follow-up by a different author. They do both warn about the risk that if you go this route you may be tempted to upgrade your home too soon and not end up putting money into retirement planning, but it sounds like you have that under control.
Just figured I would give you some additional reading.