At DarkRyda's recommendation (and it was a good one), changed the radar towers in Battle of Britain so that they respawn. This means that now the Germans can't just bomb the hell out of the factory and win. Also, it should give the idiot bots somewhere to go in those jeeps at the factory. I also bumped up the number of spawns for the planes.
UPDATE: Well, not quite. There are a lot more planes around, which makes for a busy time if you're in a Spitfire. Yay! But the stupid bots still sit in Jeeps at the factory, even when there are places to go, like the now-respawing radar stations.