Overproducing or what?

I pump 3-4 ounces from EACH boob every four hours. I pump for 15 minutes which is “draining” for me. I do 2am, 6am, 10am, 2pm, 6pm and 10pm. On month baby is definitely fine but sometimes has trouble digesting because he gulps the milk down quick. Don’t mess with his food or he turns blood shot red in the face. I have huge DDD boobs so I’m wondering if this production is normal and my pumping schedule is okay. Just wanna make sure he gets the right amount of foremilk and hindmilk. pumping every two hours seems crazy. I heard as long as I pump before five hours I’m good. What’s your opinion?