Jake 99
Living the dream!
Your program has very little for the posterior chain. I'd look for more leg work that works the legs as a whole instead of isolating the quads. Squats instead of leg press, lunges instead of extensions. Adding stuff like pull throughs, glute/ham machine, good mornings, speed dead lifts(50-60% of your max), Romanians, etc will help your dead lift go up.
^^^^ All of that, more full range. Thought off the floor would be your problem based on your program, not a bad thing just what exercises you spend your time on.