BE - So not only is [2x20 + some other spit loadout] a better than average package, but you're also saying that the spitfire is a significantly above-average choice for setting up consecutive effective passes on formations? Slightly above average firepower, low durability, mediocre level speed, all add up to a considerably easier time shooting down bombers? If the target's Ju88s, or B25Cs. Maybe Lancasters. Certainly not B26s, Ki67s, 24s or 17s. Not everything else being equal, not unless you've got 1:1 spitfire to bomber ratio.