I find one of the persuasion ability a bit annoying, Civil Abilities are given at every 4th level after level 2. What I find annoying about it is that, if you are taking persuasion skill, then you have to stick with that all the way to keep up with the increase in persuasion skill required for the conversations throughout the story. And items to boost persuasion skill is rare to find, too rare in my opinion, and because of that you have no room to add other skills that you want.
One way to fix this problem is to make the items with that skill less rare.
Another is to change the levels in which the civil skills are given from every 4th after level 2 to every 3rd.
A third option is to give the persuasion skill more value depending on the amount of skills you have in the various Attributes, other games that are based on dice rolls, like D&D add 1 point to the roll for every 2 points of attribute. In D&D, if you want to tell a lie, then you roll the dice, add skills in bluff + 1 point for every 2 points spent on charisma. What you have done with the persuasion dialog is a bit silly. You have increased the amount of persuasion points needed for success in some of the options in the dialog, instead of setting all at a set amount of skills needed, like in the dialog with Stingtail. For my character, Lohse with 2 points on persuasion the options are 1 Intelligence, 2 Memory, 3 Finesse, 4 Intelligence [Lohse] From what I can tell, option 1, 3 and 4 all require 2 points, but option 2 require 3 points of persuasion to succeed.
So how about give persuasion skill in this game 1 point extra per 3 or 4 points taken on an attribute since you do include them in the conversations anyway, and change the conversation dialog options on the matter to a set amount of skills needed depending on the NPC level? This way, if your character has 3 points of persuasion and enough to get 2 points of persuasion from one or more attribute it actually have a chance to meet the requirement of 5 points for a conversation, if there is an option in the dialog that has the attribute that give the character a good enough boost to the skill. This gives players more room for taking other skills as well.