<<Stealth does not train on these guys at 280 yet i'm able to hide, is this intended?

Without looking at the numbers, it's possible. Creature perception is often set quite differently than their combat skill, so some creatures will teach stealth very well relative to their combat training and others quite poorly. I assume you've tried ambushing various body parts up to and including the eyes?

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Use poach/snipe while using an aimable ranged weapon to extend the stealth teaching.

>>or there's something wrong with the perception settings for zombie nomads.

I'll admit I've never hunted them and don't know any lore about them, but this seems to be the likely case to me since their perception is sooooo out of whack compared to combats.

I suggest that the OP post this complaint in the folder of the area they are in. Area owners typically pay more attention to those folders than these since this covers all critters in this range across the whole game.

>Any advice on being able to find my way back for more testing?

I hunted there for a very long time when I still had a character in the desert and I have never once found any trick to locating it.

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The Kasto mimic abruptly solidifies, looking very much like Kasto.
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You say, "What a handsome fellow you are!"

Highlighting the strings helped, thank you. retested the stealth issue and it seems off, hiding in a 4 armor mix every time and no exp at 291 even ambushing body parts...