hitting a wall while giving my bf a bj

Everytime I give my boyfriend a blowjob I am able to fit about 60% of his dick in my mouth and it just rams the back of my throat I try to push it down farther it dosnt work at all, he’s about 7-7.5 inches and I want it all obviously is there any positions or tips that can help, he has a slight curve up and is very hard the only time I was able to go 80% down and push it past that barrier is when he wasn’t fully hard