Does medium armor have any detriment to sucsessfully sneaking/staying hidden while moving?

I've gotta 100 sneak but i swear caution comes up before the enemys even on my radar sometimes ( especially in owb )

Another question has anyone noticed that Christeens Silenced Sniper Rifle dosent seem to have the effect of not alerting surrounding enemys?

1. Yes, it hinders you
2. Some enemies have higher PER then others, such as Deathclaws having a high PER. As for OWB enemies, they must have a ridiculous PER because the same thing happens to me.
3. The silencer makes the shots silent. i.e. They don't hear the bullets.

Yes, medium armor does reduce your stealth capability, making you a bit easier to spot. Because it's heavier and noiser than light armor, and so harder to be sneaky in.

Thanks for the responses that helps.

As for Christeens Sniper rifle... the normal sniper rifle when equipped with a supressor gives a special effect that when you shoot someone ONLY the target is alerted...
Christeens rifle dosent seem to have this effect.... which I'm sure is some kinda oversite mabey?