FWIW, There's a lot of new bands sounding like the old classic Metal bands, they are `tagged` as NWOTHM (New Wave of Traditional Heavy Metal), such as:

- White Wizzard

- Tailgunner

- Skull Fist

- Wolf

- Enforcer

- 3 Inches of Blood

- Lucifer

- and many others

Doom, stoner doom, stoner sludge.

Bands like Sleep, OM, Electric Wizard, Weedeater, Dopesmoker, Satans Satyrs, Uncle Acid and the Deadbeats, Salems Pot, Acid Witch… there’s so so many.

Also heavier bands that are more stoner/psych than metal like All Them Witches, Mars Red Sky, Dead Meadow, Aunt Cynthia’s Cabin, all rip too.

You can maybe checkout https://hate5six.com/sage this lets you pick what you like and also what you don't like and tries to categories by percentage.

Bands that you are saying. Maybe Hangman's Chair, Pallbearer, Faetooth, Rezn, Conan, and Monolord.

The Sword might be what you're looking for - https://www.youtube.com/watch?v=iL7ndxWgW5A

You ever heard of Every Noise at Once? You can search for an artist, see the genres they belong to, and then look for artists nearby in 2D musical space (oversimplified a bit to be fair) within that genre. I've found it's generally pretty accurate, and I've found plenty of new artists this way.

Unfortunately no longer being updated, but still has a fantastic backlog of new-ish artists.

Very curious the conspicuously absent genre in your list, especially given how much of modern doom is death metal. I can't help much with traditional doom however as I don't listen to it much, I just found it a bit funny you never encountered modern death metal during your searches for slow metal.