the iso being 800 will lead to more noise disortion dependant on what camera you are using.
I went through a phase of HDR for a while,
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Major tip is do not over sharpen, as that is what will emphasise the grain appearing.
One thing i will say for it, is enjoy your addiction, then you will get bored of HDR. It can work a lot better when done
in a subtle matter. It really is a case of less is more.
very little use of hdr
So over all advice, lower the ISO, use less sharpening and finally, use less HDR to make the image more natural.
Adam