We have set up the damage over years of honing. MvR took 900 rounds to shoot down Hawker for example. Then you can get someone like René Fonck taking down an enemy with 5 rounds frequently. Both can happen in WOFF.
Get in close (very).
On a side note even a top Ace like Fonck claimed 142 victories but only got 75 awarded, as sobering thought for those struggling with the claims office in WOFF