I don't remember bFloatingPointTarget or bFloatPointRenderTarget, but you don't miss such variable, it's the one only.
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and bFloatingPointTarget=1 or bFloatPointRenderTarget=1 is have to set like that in ALL skyrimprefs.ini files include one in installation folder?
Yes. Some mod use his own skyrimprefs.ini too, don't remember which exactly, users told about it several times, may be mod manager or organizer.
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and about CoT and all mod that altering lightning and weather i've disabled it,should i uninstall that mod?
Not sure, because never used such mods myself.
Well, let's get to this problem from other side. Delete enbeffect.fx and effect.txt, enbpalette.bmp/tga/png, enbseries.ini (if exists) from game folder. Use enbeffect.fx and enbseries.ini from my official files. Do you see greyed result or it's more colorful? If it's similar to your current screens, then because of bFloatingPointTarget=1 not work or any similar issue related to game itself (hdr mode not active). If everything is okay, then issue in mods like CoT or preset itself, author may be did it for own list of weather mods or may be you forgot something and mixed files from different presets, for example palette image or those effect.txt and enbeffect.fx shaders.