In addition to the above, If you are running a Nvidea GFX card try using the Nvidea GFX Desk Top Colour option and increase the Digital Vibrance slider - this gives more life to the colours and adds contrast depth to the AC lods.
Interestingly enough, I watched a documentary and the BoB pilot being interviewed made a point of saying that it was very difficult to spot ac once formations were broken up and fighters/bombers were scattered- on many occaisions it was by pure chance that he would see an enemy. He laughingly said that the only use flak had was helping him to locate where an enemy might be.......it's the same in game, so may be CloD has that aspect modelled correctly.....
Documentary: '13 Hours that Saved Britain' Historical account of Sept 15th 1940