OP,
I think you have made a good choice… I put in another direct line last year. I had the electrician use 10 gauge romex. It made a nice difference.
I think it is important to move on these things one at a time… make each prove they were worth it. There are so many possible improvements, each can be a learning experience. Go hog wild when the last three things you did to your power really impressed you and you are now convinced major surgery will produce further gains.