Pumping question for my big boobie moms

Archana • Baby girl Jan 2017, rainbow baby boy Jun 2020!
Hi Mommies, I need help! Not sure if I am doing something wrong but I can not figure out how to double pump my breasts effectively. Prior to pregnancy I was a 34DD and post I am now a 36DDD. I've bought 3 different double pump bras in different sizes and have the Medela pump in style advanced pump and the Medela Freestyle pump and I just don't get the same amount of milk out as I do when I pump one at a time and massage as I go. Any suggestions/tips welcome! I can't pump for 40 minutes when I go back to work in April haha.