As in criminally unscrupulous? Not that I am aware of (nor am I suggesting any particular Canadian lawyer is unscrupulous).
Basically any of the bigger plaintiff-side class action shops have probably had carriage of a Part 23.1 claim. I’m aware of at least one primarily securities plaintiff-side shop in Toronto. If you google securities class action lawyer Toronto I imagine you’ll find some relevant firms.
After reading Circle of Greed, I used to think I wanted to move to plaintiff-side securities-specific class action work, but I’m not so sure anymore.
As an aside, your LSAT score is entirely irrelevant to what firms might hire you. You just need to get into law school and get good grades.