Not to beat a dead horse (with regards to the whole '170+ from Yale' thing), but there's another factor that no one has considered: the OP played a sport.
The fact that the OP played football/basketball/whatever sport may have been a large factor in UG admission. Someone from my high school was offered a spot at Yale to play football contingent upon his ACT score. He only would have needed to get I think it was a 26 on the test in order to get in, as they still have certain standards for athletes, but not nearly as high. Normally one would need--what?--34+. (Side note: he came up ONE POINT SHORT and went to Case Western instead. Ouch.)
Anyways, my point is that the OP does not necessarily have an ACT/SAT score that is on par with most Yale UG's, and thus would not be expected to have the same range of LSAT score (assuming there's a correlation). On the other hand, one might argue that maintaining a 3.5 (even in a soft major) at Yale is indicative of great LSAT potential. Who knows?