Sticking to 1 cloud layer and 1 stratus layer.
Cloud layer 18k, .500 opacity.
Stratus layer heavy, 21k opacity .530.
These screen shots are at 08:00 and 12:00 to show different times of the day and the light effect on the subject. I'm thinking of putting a cloud layer over tank island at 10k doing this to help bombers fly lower if they just have to grief the GVer's with carpet bombing. Some of those GVers are pretty good in fighters killing bombers.
Alt: 24.7k feet. 08:00 21k stratus layer through Tu2 scope looking at the city. Morning and evening will make it easier to see through the layer.
Alt: 24.9k feet. 12:00 21k stratus layer through Tu2 scope looking at the city. Almost cannot make out individual buildings but know the target area is in your scope. As the sun moves higher the layer begins to gain a stronger white out through the scope.
Alt: 26k feet. 08:00 21k stratus layer and now 18k cloud layer. Unless you get your timing right, you can see the cloud moving over the radar strat about to block it as a target.
Alt: 25k feet. 12:00 stratus layer and 18k clouds layer. Because of the random nature of the fronts I setup, I had to take two screen captures so you can see yes the target is open for a moment but, if I had been later, it would have been covered over as you can see happening in the second 12:00 screen shot.