The revised character sheet for SWN appears to be calculating attack rolls wrong, seemingly as some sort of holdover from the original character sheet/system. Attack rolls are requesting an AC be input, subtracting the entered amount from 20, and using the result as a modifier on the attack, sort of similar to how attacks are calculated with THAC0. However, the actual rule doesn't subtract the target's AC from anything-- attack rolls in the revised system are just a d20, plus all the relevant modifiers, measured against the target's AC. As far as I can tell, the (20 - X) [AC] section of the attack macro can just be removed, and the user shouldn't need to enter their target's AC when each attack is made, as the DM can just say whether or not their attack roll hit.