I'm playing unpatched, vanilla Skyrim on Xbox. I've read in the wiki that Fortify Sneak is bugged such that it actually reduces rather than fortifies. Do the Stealth skill perks do that as well ("You are XX% harder to detect when sneaking.)? I'm actually looking to take the Muffled Movement and Silence perks and have to burn at least one Skill Point in Stealth to do it, but don't want to sabotage my Sneak in the process.

In a related, but separate question: If you have the Unhindered perk making your light armor weightless, are you also silent since armor noise is based on weight? I'd rather not burn Skill Points in Sneak if I'm already getting the benefit in Unhindered.