GISD not checked was the reason for all the floating objects in all my images (also other projects).
I tried higher occlusion weight but got too dark frames on all object edges (especially the room corners got too black). I tried many settings and 0.8 occlusion weight and 25 radius was the best compromise.
What does bounce to the ounce do? perhaps I can play with this setting too?
At the moment I test a big render of the inside view of the room with GSID "on". Unfortunately the function seems to be added after finished rendering earliest. The smaller render already shows first success. The rack with the bottles on the right side didn't throw a shadow onto the wall before, what disturbed me most.
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Only 720p / AA3 / details0.3 upscaled. That was the first test with the new settings. I almost completely needed new light setting including gamma, sunstrength, camera exposureand others... but the light outside the windows now looks better. Also I moved the sun a bit to get a slight shine onto dog's nose. At first sight seems quite dark, but after looking into all my rooms I found it's much more realistic. (I think HDR effects are intersting but I don't really like)
(Besides thanks for the suggestion with the pots, I did not ignore but somehow I like these plant pots with the basket look
)