I think you shouldn't rule out all combos of KK+ from Villain's range.
After all, he has a 3bet of 0. It's only 173 hands, but you haven't yet seen any evidence that Villain ever 3bets PRE, much less 4bets.

After 173 hands, there is still ~25% chance that Villain has simply not been dealt KK+ yet.

Consider including only some of the KK+ combos when you do your calculation.