High Bow Grip
I think that my bow grip is higher on the stick than most violinist's. Are there any technical disadavantages to this? Can it just be because my hands are small?
Depends how high up you go. Players with a Russian grip tend to "choke up" a little on the bow, but if your index finger is extending beyond the bow-wrap, your hand is placed too high.
This is a question for your teacher, who would be able to tell if it's affecting your playing.
I think Baroque specialists using Baroque bows hold the bow away from the frog. The bow can bounce easier if you hold it away from the frog.
I play with my thumb on the thumb pad and my fingers moved up accordingly.
Moving up the bow an inch or so, with the index finger at the top of the winding in my case, makes the bow feel lighter. It does rob you of some bow length, which can be limiting. If you move too far up it starts to feel weird for me because the distance between the hair and the wood of the bow under your hand is a lot less, plus the frog acts as a powerful counter weight. I will move my bowhold up and down the bow by up to an inch depending on what I am playing and what style I am playing - good to have options!
Re Ella's comment that "Baroque specialists using Baroque bows hold the bow away from the frog" — that's not always true!
I do this when I am tired and clumsy.
Do whatever is comfortable if it does not affect your playing.