By the way, I looked over the races again and stumbled on a few things:
Dwarves have size 1d6+4, just one point more than halflings, and actually goblins have 2d6+3 which is more than that. Why is this, Size is not just a value determining height IIRC. It also determines how much you weigh. Elves again, have an average of 3 points more in Size, yet it says they weigh around 40KGs. That's kindda weird for a guy who is pretty close to human SIZ. He weighs about half that of an average human. Gnomes are described as weighing around 20KGs and being less than 1 metre, yet they have a SIZ of 1d6+4. The same as a dwarf who is described as 1.30cm.
Since damage and HP is based so much on SIZ. This change has actually brought with it that the average dwarf is a worse fighter than a base human. This is IMO ridiculous.
Also, I can see no mechanical benefit of being human, and would thus suggest that their charisma gets increased by 6 instead of their adaptive rule. +6 Charisma gives all humans +1 to their improvement modifier. Which fits well with learning fast, and mastery of a wide variety of skills, charisma also fits well with humans being the largest race, and therefore they are the least likely to be suffered racial discrimination against.