Hey bro, I help a lot of athletes and many guys outside of BB are here to learn and ask questions. So you are in good company :) 

Ok so for increased intake of O2, I would first look into ephedrine. 25 mg is a standard dose. Remember this is also a CNS stim, so it can and will raise heart rate, as well as cause issues like insomnia. 

Another option to look into is clenbuterol, which is a medication used for asthma. Like ehp, it dilates the bronchial tubes and will let O2 in. I would start with 20mcg and see how that works. Then go to 40-60mcg if you are comfortable with it

These would be the first directions I would go. If, down the road, you want to use anabolics to increase your speed, I can help you with that too. Just let me know brother.