Back on that. Don't be annoyed, it's not so sure.
We know that final scores are 16, 15, 14, 13, 11, 9.
If it was +1 to all, it means that original is : 15, 14, 13, 12, 10, 8. That is 27 points. Not the basic 30 points nobody said they will change. So it doesn't match.
Now, imagine the following :
Original is 15, 14, 13, 13, 11, 9. That is 30 points. So far so good.
Than add +1 to only 3 abilities, the highest of course. You got : 16, 15, 14, 13, 11, 9. It matchs perfectly.
And I guess that giving +1 to 3 instead of 6 abilites is a good hit according to the different point of view on this forum regarding humain abilities bonus.
What do you think ?