I roll with a Khajiit stamblade, Level 1 vampire, 3x Night Terror, 5x Darloc Brae, 1x Wild Hunt, and the other 3 pieces don't much matter. 7x medium, 3x Swift.

I'm never detected unless there's a reason, such as detect-happy mobs, an interaction with an object, or not restealthing when I get out of the water.

And that was even before CP 2.0 added a stealth radius reduction bonus of its own.

Note that Darloc Brae gives a lot of sustain while sneaking.

It's not a great combat build, for reasons that include set bonuses, several stealth/non-combat skills on the skill bar, and one of those skills being the opposite morph from Surprise Attack. But it sure keeps me out of combat a lot and lets me move quickly. And it's plenty strong enough for trash fights and easier bosses.