(Enchanting and smithing both 100, include potions please. Also I have any soul gem you want readily available.)
find something with a fortify smithing enchantment and disenchant it
enchant pieces of armor as much as you can with it
find/make/buy fortify smithing potions
(blisterwort, spriggan sap, glowing mushrooms, and sabrecat teeth all have that effect)
use the potions, wear the armor, and then improve the weapons