Next time you max try this:
After you have the weight loaded sit on the bench and take a few deep breaths. Take a shallow breath in and lay back. Exhale firmly to clear the lungs. Breath normally as you get set up with grip and placement of feet. Take a couple of quick deep breaths then exhale firmly again. Take in a large deep breath expanding your chest as much as possible. Pick up the weight (if using spotter do your countdown or however you like it) and center it over your chest. You should still have a lot of air left in your lungs but try and pull in as much more as you can. Lower the weight and start your press, just prior to lockout breath out. Rack the weight then take a couple of slow deep breaths before you stand up.
Cheers,
Scotsman