You shouldn't be doing singles more than a couple of times a year. Put yourself on a couple of cycles per year where you work from 10 reps to a single in 12 weeks. I did like 1 week of 5X10 reps after warmup, then two weeks at 5X8 (increasing weight each week even if its only 5 lbs), then two weeks at 4X6s then two weeks at 3X5s two weeks at 4s, a week doing 2Xtriple, a week 1Xdouble and a single. Keep a detailed log on what you did in the gym, what you did throughout the day and how you felt before hitting the gym. What you do outside the gym affects what you do inside. And again, don't burn yourself out warming up. Then take a week or two off. Make sure you work out at 100% each time and that is where what you do outside the gym will affect you. Get rid of distractions. What I also did too was as we decreased our reps, I decreased our accessory exercises. Believe me, when you're pushing 3 sets of 5s like you're supposed to, your chest shoulders and tris should be tired.
Also keep good form. Your shin should be at a 90% angle with the floor. Push with your legs, through your butt without lifting it off the bench. I liked to bench with an arch because it kept me more stable and could use my lats to drive through the lift. Keep your body tight for stability (don't squirm around the bench like a lot of people do). Try to have your friend to give you a liftoff so you can set your position. You'll find that you won't keep your position if you have to lift off by yourself. Don't forget your abs every workout. Its your great stabilizer. PM me if you like.