Try putting a decent sized block of the paint up on the wall, say 20cm x 30cm , then walk around the room viewing it from all angles. That's when I really noticed it was shiny, as it does vary depending on how the light is catching it.
Well, I've been doing similar, holding the wood I tested on walking around my room ant viewing at different angles, and all the greys look flat/ matt to me barely any visible sheen, just the very, very slightest amount. I think I have very discerning eyes, too.
Most of your colours look like they'd be below 110,110,110 so should be on the deep base even for the vinyl matt tester pot, so if they're not looking shiny maybe dulux have changed something in the 2 years since I was trying this myself.
Well, all the tester pots say 'deep base'. Yes, perhaps they changed something. I can ask them next I go in store to see if they know about the issue you had back then.
So, to confirm, do I need to worry about trying medium base with any of the greys I like above?
I was only taking the RGB values from the above charts on the dulux site, so I don't know how you'd find equivalent RGB values for the other colours you mentioned, sorry.
I was looking at various online sources to derive mine. Do you have a link for the RGB values on the Dulux site? Is that what you meant? I think I remember seeing them on there somewhere, but not for every shade.