Knowledge Points are more important than Skill Ups. Adding Knowledge Points into a Specialization will increase your Skill at making those things.
I’m sitting at around 73 Skill and can almost guarantee a highest quality Epic Leather Chest based on how I spent my Knowledge Points.
That last bit of Skill is meant to take a long time.
They are reducing the amount of Skill needed to unlock the last 2 specializations in 10.0.5, so that last bit will matter even less in a couple of weeks.