My dragonbone swords do 118 damage each and by Dwarven Crossbow does around 160 to 200-something. I've enchanted some clothing with smithing perks and I used a 50% smithing bonus potion but 118 damage for each of my dragonbone swords was the most I could do. My smithing is 100 but I didn't really rank up my enchanting or alchemy, I only use enchanting for weapons and armor.

Before I tried upgrading my weapons for the last time my dual dragonbone swords did about 104 damage each and dwarven crossbow did about 150. Also where can I get more smithing enhancement potions that increase my smithing by at least 50%?

Do you have to Dragon Armor Perk? That will double the effect of improvement.

Yeah I do, I have every single blacksmithing perk. Does difficulty affect damage statistics? Beause I was on apprentice difficulty most of the time. I just upgraded to Adept. My character is level 58 btw.