I was in the same shoes as you... Fall semester I had a B+ B+ B+ C+. Spring I had mostly Cs. Ended up with a B- GPA (a bit lower than that actually).
I didn't use supplements because professors said so, and I didn't trust them over what the professors went over in class. I guess I spent too much time perfecting the grammar in my essays. Didn't use office hours. Focused on unimportant stuff thinking I can take care of everything. Briefed EVERY case (might as well publish a case briefs book). Took notes on post-case notes. Outline too nuanced and missing the simpler broader concepts. Had girlfriend drama the whole year. Ultimately underestimated the power of 1L grades. Most of my professors were awful, too.
I still landed a small firm job (1L) and an in-house position (2L).
The firm job, I initially missed the opportunity because they had filled their needs by the time I applied (found and cold emailed). In May, I got an email asking me if I were still available. The managing partner had gotten a case he needed help on and had my resume, among others, on file. I guess I was the only one without a job (I actually had another one, but that one turned out to be a dud, long story).
During 2L year I raised my GPA by 0.1 or so, so it was still unlisted (i.e., shit). The in-house job I got through a job fair at school. I didn't make the cut at first, but I had gotten the hiring manager's card at the fair. I used that to get in touch with him and got the interview that way. I prepped hard for the interview and got the job. I got an email in JULY from a firm I applied to, asking if I had an internship lined up yet.
The point is that I still don't know why I can't seem to get higher than a B+, but you can still get noticed if you put yourself out there. Like yuzu said, the curve forces small distinctions in ability for the employers' convenience. There's likely little difference between you and the top 10%er in your ability to do the work. Maybe the top10%er is worse at it because they succeeded by rote memorizing and using tricks others taught them. In a way, law school separates those who ALREADY know how law school and law firms work. I mean I drafted a brief for arbitration on my own at the firm, and it got our client a full recovery ($610k award). I learned by getting a shit prof in moot court and applying the lessons from failure and frustration.
Now the true challenge is finding a post-grad job...