Actual attribute requirements, when relevant do probably depend from specific encounter.
Here is the testing sample I did in other thread:
Persuading the executioner at the gallows, Act 2.
7CON + 4PER - SUCCESS
22CON + 3PER - SUCCESS (fails with 21CON)
34CON + 2 PER - FAIL
10STR + 3PER - SUCCESS
26STR + 2PER - SUCCESS (fails with 25STR)
34STR + 1PER - FAIL
35WITS + 5PER - FAIL
As you can see, when attributes were relevant, Con check required 22, and Str check 26. But with high enough Persuasion, neither of them was needed and with too low Persuasion, even much higher attributes would lead to fail.
This does seem in line with your test samples, but your encounters are in early Act 1, and there most of the checks with attributes require much lower values (like 12INT or 14WIS in your examples).
Last edited by player1; 17/10/17 10:10 PM.