Gas in 6 week old

My little guy is 6 weeks old, I pump and feed and use Dr Browns bottles but he is SO gassy allll the time. It’s worse at night where we are up for hrs at a time trying to get him comfortable. His stomach is rock hard and he squirms all over and cries in pain. He’s been on probiotics for almost 2 weeks and he is def passing gas better then he was but I’m looking for other options ontop of the probiotics. We’ve tried gas drops & gripe water and neither do anything for him. Maybe I should try switching bottles? Any input on good bottles for gas other then Dr Browns? Thanks!