I took the LSAT this year, actually studied this time around, and received a 170+. I come from a target school, 3.9+ GPA, all that fancy stuff. I think I'd have a good shot at a T14 school. Plus, I actually want to go to law school this time

Does anyone have any insight as to how top schools would assess my awful LSAT score from 5 years ago? Is it worth it to include an addendum? Certainly my two scores wouldn't be averaged, right?
Alternatively, is it worth it to apply next year, once my old score will be wiped clean? My understanding is that LSAT scores disappear after 5 years, but I'm already in my mid-20s and would prefer not to push my application another year if it can be avoided.