I think Autodidact needs an increase in skill checks as you gain tokens. It's already hard enough to get to 5 tokens because of the randomness of skill checks. It would be fair if the player is rewarded for all of that healing and earning tokens. There are rare times where a player gets to five tokens but still isn't able to use the benefits of the perk because it doesn't proc a skill check. By the time you get to 5 tokens the game will be over or you will be dead.