On your deadlifts knee extension is preceding hip extension. These two need to be in sync. A big part of the problem is your set up. Look at how far your knees and shoulders are over the bar. You have to do this just to keep the bar from hitting your knees. Sit back on your heels, falling backwards as you ascend, driving through your hips from the start. Get your shoulders behind the bar slightly before you start pulling. Overall you seem a bit quad dominant at the moment. Learn the wonders of the posterior chain!
On your OHP, get your lats engaged. Before you start, pull the bar to its starting position like a lat pulldown until they are engaged. Then keep them engaged throughout the press. They will provide nice leverage.