Your last scan is rather clean. OK channel 6 is busy, but will be no problem. A really clean 2.4 GHz is very rare to non-existing.
You have the tools now to find a clean channel for your AP.
I moved AP a few and could find some clear spots and also some busy ones, I’m going to move it in every possible corner to find the best spot.
I will also try to find a spectral analyzer for my laptop (if there’s any) and use that to figure out if there’s a problem with placement of laptop (I mean where I put it most of the time)