I actually got the execution scene to finally pass yesterday after I stack even more persuasion from some other gears.
There's one scene I failed on Nameless Isle though and a key npc had to die.
It's really ridiculous. Shopping around for +3 persuasion from gears and racial is something I better have at all time starting from Nameless Isle. Even if I flip a mage with some weird stat like 40 mem to go persuade them simply because I didn't wear persuasion gear on every possible body part.