Mistwell
Crusty Old Meatwad
Music instrument proficiencies, like gaming set proficiency are imbalanced vs thief's tools. That is a general problem. Maybe giving proficiency points and have them cost a different amount would be a good idea.
The medicine skill is also one that is as badly explained as perform. And perception is more or less too good to pass. Riding is outright missing.
You can gain proficiency in any tool using downtime days.