I have several questions about different game mechanics. Please answer as many as you can

1. Does the atronauch perk reduce damage taken or just add to your magic count? This doesn't seem to work against dragons - I assume because shouts don't consume magic?
since the shout...?)
2. The magic resistance perk - does that block damage from spells or affect the chance of a spell like paralyze landing? Does it work against dragons ?(
3. Do the magic cost reduction perks not affect dual cast spells? It seems that a dual cast spell costs more than the same spell cast twice.
4. Do two potions with affects that, say, increase smithing stack? Is there a cap if they do work together? How does the +smithing work? Does it just make it so you can do a higher level of smithing - exquisite to legendary or whatever? Or does it actually increase the number independently of the quality?
5. How many hits does a poison last on your weapon with no perks?
6. What specifically is the difference between a regular bash and a power bash aside from holding the button longer to execute it?
Thanks again.
1- not sure about this either, I think its a 30% chance to all the spell dmg to be drained to your mana bar, so 1 every 3-4 spells that hit you, have no effect or damage and fill your mana? not sure if its the casei n skyrim
2- tooltip is confusing by I think its incremental resistance, as in damage mitigation and duration reduction of stuff that hits you, also needs confirming
3- yes they do, problem is dual casting has a 2.4 mana cost multiplier for a 2.2 damage multiplier, it basicaly turns your spells a litle stronger, by costing alot more mana, so oonly use it on downranked spells (cheap ones) this needs a tweak imo =<
4- same effect potions do not stack but effects from a potion stack with another source (like enchant) that have the same effect, and no, +smithing enchants/pots dont allow you to make diffrent armor as those come only with perks, they are used to upgrade armors/weapons to higher qualities
5- 1 hit innit? I admit I never look at my inventory to check if the poison is still there after hiting a mob tho

but I think its 1 hit base, with the perk 2 hits.
6- a power bash applies more force to the target, there are 3 effects that I have observed after a bash or power bash, one is a minor stagger, the other is normal stagger and the last throws your oponent back/down/on his knees, the ffect that you get depends on how strong the bash is oposed to how strong the enemy is.
a simple bash is weak, and only stagger weaker mobs, a power bash can stagger stronger enemies such as dragons and thow down weaker ones.
it also chains into other perks, like more damage (wich is high), and a disarm.