Hi guys

Currently modifying/designing 3bet ranges against specific types of Villain's and here's a spot:

Villain opens 2.5x in EP, Hero 3b to 8.5bb

In this instance Hero's risking 8.5bb's to win 4bb's; 8.5 / 8.5 + 4 = 68%

Does this mean Hero's 3bet range should be 68% good against Villain's opening range or Villain's continuing range?

What are your thoughts on 3bet range construction? All answers will be appreciated. Thanks in advance!

edit: in the spot I'm studying I noticed how tighter the range would be if we designed a 3bet range against their open and I think this is because of how some of the strongest hands are still in their range.