When it comes to pressure on soft tissues, your own shape, your saddle's shape/fit/firmness, and the fit, design, and thickness of the shorts all play a part - and there are probably things that aren't in the list that impact soft-tissue pressure. Oh, yes, like your position on the bike....
Chamois use to refer to thin leather from chamois, a type of sheep, IIRC. Thin. They got wet and soft and thereby reduced friction when pedaling.
Now 'chamois' generally refers to synthetic pads that provide various levels of cushioning and wicking sweat out of your crotch. The pads come in shorts - clothes. Clothes fit people differently. If you don't know a person, you can't predict what clothes will work for that person.
Physics, however, tells us that the more stuff one puts between soft tissues and a seat that will be hard - either because it's built to be hard or because the rider's weight will compress the padding as much as possible - the more likely it is that more pressure will be put on the soft tissues, and more pressure means, all other things being equal, more numbness. If you're worried about numbness, your best bet with a conventional saddle, in theory, is likely to be hard saddle and thin or no pad.
But theory doesn't always work for people, maybe because there's more to comfort than avoiding perineal numbness. There's no magic, one-size-fits-all answer - you have to try shorts on to see if they seem to fit, and you have to ride in them to know if they're comfortable. It's trial and error. There's no way around it.
If what you're using now is uncomfortable, try something else. Anything else. If that's comfortable, great. If not, try something else again.
From what you've written, mountain bike shorts with a liner seems like a good place to start.