I think you are doing really well with going back into the dream. That takes being calm. I think you are making great progress in a short amount of time.

But as to getting too excited, I had the same problem in the beginning (and sometimes still do). I would get way too excited and it would shorten my LDs. If I remember correctly I would always have to focus on an object and try to see more detail. That would sort of calm me down and take my mind off being excited while strengthening the dream. I think if you search you will find similar techniques.

I think it will get better over time as the novelty wears off a bit and you become more used to being lucid. It did for me at least.