This is just my opinion, but I think you're overthinking this. If you have two good LORs send them in, it can't hurt. You numbers are what's going to get you into law school (or get rejected). Things like LORs play a very small role. If you do get waitlisted, then an extra LOR may or may not make any difference. My guess is that the vast majority of waitlist admits are simply those who had the highest GPA/LSAT profiles from among the waitlisted applicants.