Yeah i am not saying that Sanct. Wrath is inferior for this fight. Infact, i prefer it over Holy Avenger myself. But if you want to tunnel legs down combined with weak points Holy Avenger is strong aswell. Also, if you are using Divine Storm instead of Templar's Verdict it works well (not your case, just saying).
About HoW, i find it hard to believe that top parsing ppl was only doing 25 HoWs. That number sounds abit low to say the least.
Maybe you checked on someone who was NOT using Sanct. Wrath, so that results in less HoWs than someone who is using Sanct. Wrath