Ok so i have the enchantment of blocking, i go to put it on my shield, i use a common soul gem filled with a common soul and it says that it will increase it by 1%, what gives? only 1%? it's filled with a common soul, so why such a low number? i'm on PS3

What is your Enchanting Skill? What Perks do you have? Common Souls, further, svck. Don't bother with anything lower than Grand or Black for Enchanting your gear with. Anything below these tiers you use to level your Enchanting on gear you sell to vendors or recharge your weapons with.

The level of enchantment depends on the kind of soul gem you use. I wait until I have enough gold to get a grand soul gem and then it is off to the enchantment table.