Aleena died for your sins.
The adjusted to hit AC is for the weapon adjustments to particular armor classes, not THAC0.*
You played AD&D, right? That was the thing that almost no one used because it was super-fiddly.
Again, because it was assuming a table, not THAC0. If you had THAC0, you wouldn't have a list of armor classes .... you get that, right?So did the B/X Character sheet:
*EDIT: In case it was unclear to you, that's why it goes to AC2 (Plate + Shield) and not AC0.
Second addition: More importantly, what is on neither character sheet, as I stated? Hit: It rhymes with Wakko, of the Animaniacs.