As Skafloc has already said, RAF should be in 3's for
BoB, Luftwaffe fighter in pairs and bombers in 3's.
When playing scenarios the RAF should always be at a numerical disadvantage even if that is just by one airframe. Obviously you have to "run what you've brung", but I would invest in at least 4x 109's and 3 111's which should be a core element. Against 3 spits and 3 hurricanes these would offer a "fair fight". Throwing in a single 110 to the mix and it gets far trickier for the RAF.
If you're going to increase either side, favour the Luftwaffe, particularly with bombers (which can be left to autopilot on a straight course, (defending themselves) leaving the Axis players to concentrate on providing fighter cover.
This is how I weight my demo games at cons.
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