2. For the schools you listed, aim as high as possible. 165+ with a 2.8. It also matters significantly what your best 2 and last 2 years' average GPA are, because those are the calculations used for Queens and Western respectively. So if you have a 2.8 cGPA but a 3.5 B2 (best 2) then you might have a pretty decent shot. That being said, you will have to ace the LSAT regardless.
3. I have no idea about this. Access is, I wouldn't say, easier, but rather more forgiving or understanding on the basis of some kind of ailment or disability you have. However ADHD and depression might not fit the typical Access profile. Moreover, while it is very unfortunate that you had depression and I hope you are doing better, I don't think the best advertisement to a law school is to tell them that you were depressed for four years. It just doesn't inspire confidence. Honestly there's a debate to be had over that but personally I wouldn't do it.