The first one is amazing. I'd work on that a bit more and I love the contrast and boldness of the blacks and whites, but I'd run the exposure slightly lower, or try to use some recovery to reduce the whites just slightly to bring some definition to them because they are a bit too blown to me and I feel like I'm missing seeing the textures of the surfaces and other stuff there.
So try to keep the blacks black, reduce the whites slightly to show a bit more of the lost info, try to slightly raise shadows or reduce blacks while keeping them black, and I think it would look stunning.
You're onto something with that type of processing, IMO. Keep that style and save those settings for that particular ISO and exposure. Just tweak it.
2 is good, though I'd raise the blacks/shadows slightly and raise the lights (or exposure) just enough to give that nice contrast, like in 1, without going overboard.
The color one does nothing for me, sorry.
The last one is great, too. Deepen the blacks, add a bit of lights or exposure to it at the same time, and you'll be good to go.
Also remember if you want those nice, bright whites, use more recovery and then add more exposure and/or lights control.