I have no idea anymore.
Everyone is simply doing that stupid calculation from those reflectance charts and multiplying it and using it directly as linear value in diffuse slot. I find it totally wrong.
The only materials in CGI that convince me of their looks are metals, because it's so easy to create them, they're just specular. But everything else looks off to me, like everything, it dissapoints me but I don't know what to do about it right now.
I love those threads you mention, don't get me wrong awesome if you know the theory behind it, but from the point of having to produce images at a rapid space, f*** that. My clients can't tell the difference, only you the artist can ( half the time, i'm still a n00b), its nice when doing something for yourself. But most of the time they couldn't care less. For clients its either to shiny or it needs more shiny.
And besides, when In doubt take a real picture and start eyeballing.
Unless your doing Product renders I imagine.
OP : Your kitchen is really too pale. Also i'm confused with your environment, it has about the same brightness as your interior. It should either be darker or brighter. ( if you know what I mean )
Crap i'm mumbling again, bottom line, your images feels to linear.
Other then that, nice picture!