[BlazingAngles]

I started the German Campaign recently and is climing up the rank structure, however, i encountered some missions where the clouds are hitting my performance real hard. I set the Cloud to On in my realism setting at the beginning of the campaign, but now i want them off. However, the game would not allow any change after the initial setting. Is there any way to fix it? like change a cfg file or something like that. I know the easy way is to restart the campaign, but i would lose all my record for that campagin. can any one help me?