A bunch of random questions for all of you!

1. First, find out what percent 34 attack is of your overall attack:
Add up all your weapon attack on all your gear (including set effect), all your passive skills (including Blessings), and all active skills and potions you usually use.
Divide 34 by that. Say your overall attack is 200, dividing 34 by that tells you that it's 17% of your attack.

Assuming you have no %str already (since you say none of your gear has potential), you will need the same %str as the %attack you calculated in the first step. In our example, 17% str.
If you already have some %str, the calculations get a bit trickier.

So basically, I have 290 ATK, including the weapon (if I calculated it correctly, I don't know), so I'd need ~9% STR to get the equivalent of all of that ATK?