Iskopiracu ceo moj post sa AVSIM-a 
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I nailed it! After who knows how many months of tweaking SweetFX values, and tweaking my own sky textures (morning, noon and afternoon), I finally got what I searched for. 
Before I get started, I must warn that sky textures and sweetfx preset is calibrated for my monitor and in DX9 mode. I hate dark visuals in FSX, so I made brighter SweetFX preset with some calibrated colors for photorealism. I bet that on 90% of monitors this will look good. If not, just tweak a bit this values in sweetfx:
/*-----------------------------------------------------------.
/ Cineon DPX settings /
'-----------------------------------------------------------*/
#define Red 12.0 //[1.0 to 15.0]
#define Green 9.0 //[1.0 to 15.0]
#define Blue 9.0 //[1.0 to 15.0]
#define ColorGamma 1.5 //[0.1 to 2.5] Adjusts the colorfulness of the effect in a manner similar to Vibrance. 1.0 is neutral.
#define DPXSaturation 1.0 //[0.0 to 8.0] Adjust saturation of the effect. 1.0 is neutral.
#define RedC 0.36 //[0.60 to 0.20]
#define GreenC 0.36 //[0.60 to 0.20]
#define BlueC 0.36 //[0.60 to 0.20]
#define Blend 0.9
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for DX10 SweetFX preset, disable SMAA, enable Lift Gamma Gain with these values:
/*-----------------------------------------------------------.
/ Lift Gamma Gain settings /
'-----------------------------------------------------------*/
#define RGB_Lift float3(1.000, 1.000, 1.000) //[0.000 to 2.000] Adjust shadows for Red, Green and Blue.
#define RGB_Gamma float3(2.200, 2.200, 2.200) //[0.000 to 2.000] Adjust midtones for Red, Green and Blue
#define RGB_Gain float3(1.000, 1.000, 1.000) //[0.000 to 2.000] Adjust highlights for Red, Green and Blue
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NOTES:
This test is done with FTX Global + SceneryTech, REX Clouds, Shade, mu Sky textures and Sweetfx preset.
This set contains only morning, noon and afternoon sky textures! I'm using REX dawn and sunset textures, so you must provide these textures by yourself. 
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So, I took this RL photo as a reference, added some minor brightness for realistic exposure:
And I made sky texture and SweetFX preset to match the reference photo:
Zoomed:
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Examples and comparisons, 32km visibility (20 miles):
^^^^^ (note the realistic haze effect, which is a bit more saturated on afternoon sky texture, also from RL photo reference)
Taken from 20000 feet, 80km visibility (50 miles):
Sky at 34000 feet, 80km visibility (50 miles):
Bonus shot: 
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You can download SweetFX preset here:
https://www.dropbox....FX_settings.txt
Sky textures download:
https://www.dropbox....my1vfxg/Sky.rar
Unpack and copy sky texture files to FSX/Texture.
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Test, and report back, hit me with some screenshots. 
If this set is good for the masses, I will upload it also in the file library here.
Cheers, enjoy, and thank me later.
