I have seen this too. So I dedicated several (real time) days to getting my alchemy up and almost my enchanting up. lets just say I took my daedric legendary bow that's normally 75 damage points and upgraded it to 150 damage points, then with enchanted armor for bows upgraded to 250+ (no arrows) damage. Now, I have not fully got the proper enchantment points/skill to get my daedric bow 600+ yet. It is such a grind to find the proper materials to make the potions.
on a side note, doing my alchemy grind for two days took my 30K and turned it to 150+K and gave me 35 Daedric hearts.
but as said before, it DOES cap out at a certain percentage. This I know because my enchantment potion (fortify) would not get past 31%. but then again, I am not fully upgraded in skills yet to make the most out of it..
Let me know if interested and I will post the Youtube link to a guy that explains it VERY well, step by step.