I'm on a HDR 4k monitor so it's displaying blacks as they shjould be - the issue isn't that they're not dark enough; they're too dark. Having rich blacks is a good thing indeed, but when you're clipping dark areas into black and loosing detail, then it becomes a problem. Heightening the lower end of curves/levels without altering the base black point of an image keeps the darkest part of the image dark, but you can still see into those dark areas.
Take this histogram for instance. See the pure black area? You should be able to see all of those details still, but they should just be very dark. To the extreme left would still be pure blacks - so you'll still get the pure black you're talking about, but you'd have more range. What too much contrast would do is crush all of those details and mush them into black, so you'd loose detail, regardless of how dark your monitor can display areas of black. Too little contrast would never give you true blacks. To be honest, mine may be a little lifted in that regard.
Look at the diffuser on the ferrari above - it's still dark in the darker areas (though it could do with being deeper right under the car), but you can still see detail in dark areas. On the image above, it's all completely lost. On an OLED monitor, it appears even worse - it's technically not, but it would appear so as the area is now
super dark.
As said though, yours looks good! It's not as if I think it's 'wrong' at all, I just prefer to see detail where you should. Inside the cabin is completely lost on the original SKY, for instance. I'd rather see areas that you'd see in real life.
But I suppose that's what the GT variant is for...