The following is the formula for Manitoba:
Index Score = (Your highest 𝐿𝑆𝐴𝑇 𝑆𝑐𝑜𝑟𝑒 − 120) / 60 × 50 + (𝐴𝐺𝑃𝐴 × 50) / 4.5
Your Index Score should be high enough for you to get in first round.
It's both -- my best years were my 3rd and 4th.
Thanks for the feedback! Queen's is my third or fourth choice at the moment, so I might drop it and look at something like Manitoba if I've got a better shot at getting in there. I've never even visited Winnipeg before, though.
You are good for Manitoba and UNB in General Category.
Is 3.17 you L2 or B2? You may need 3.5 B2 for Queens in General Category.
With 175 LSAT (Great Score!) your chances are great if you qualify for Mature Category in any Canadian law schools.