Please clarify but looking at the perks that you think need to be changed and inserting your ideas.
What values need to be changed?
The only way to get away without serious testing is to go with small changes to the stats. But then the perks won't change the game dynamics substantially.
I spent already a day or so testing the new combat system and could not conclude much from it besides that mobs hit more if you are above their league. Each perk would need to undergo similar or more extensive review especially taking into account multi-combat situations. So, imho too much guess-work is involved without an appropriate test environment.
Having said that: perks helping with attack should in general weaken defense and vice versa.