Yea I think that is the best response. I don't think many schools will care about your 149, because they can report a 158 to U.S. News and LSAC, which is important to them. I remember a lot of schools only caring what your highest score was and not averaging them at all. 9+ points is an impressive jump, but I don't think any admissions officers would give much weight to the 149. You did something right, because you made an impressive jump and they can report that to U.S. News and LSAC, just say you studied better or were less nervous etc. It is not something to worry about to much and good job on the improvement!