Frost caves and the cure for baldness

I have now discovered and processed 10 Frost Caves. One was really cool, had multiple cultists and I found 38 hairs! The other 9 ranged from 0 to 15 with an average of 8.2. Four were on Moder Mountain, I got 20 there in four caves. I suspect I am missing something. I smash the shit out of everything I can find except for chests and standing flame poles. Very grateful for all the fine wood! Any weird looking wall I smash, figuring any self respecting cultist would have a secret door or two. But the only ones that give way are the frost walls with cracks you can see through. I have gone up and down the steps into the deeper caverns.

I smash the hair stands with a staghammer. I collect items from the display pillars. I smash the bone beds. I smash the hanging that look like rotted fabric but sound like wood when you smash them. I smash the braziers even though I have more bronze than I can shake a stick at. I search the meat piles, the bone piles.

One cave had a pond with Tetra fish but I could not figure out how to swim down.

WTF am I missing?

I like exploring these things. But they are miserably hard to find. Then when I finally find one and it's just a few rooms with bats, not even any dogs - well that stinks.