Mix your weight training up with some high volume intensity and medium volume intensity as well. This means how many reps you do, and also how hard you have to work. Lactic acid will be released while you are working out, and that will stimulate your muscles to grow.
Try to do bench presses and squats in the same manner that you do deadlifts, which is from a complete stop. Utilize bench and squat movements in the power rack, and allow the safety bars to be set at a certain point where this bar is at the bottom of these moves. You need to let the bar settle on this point. This helps you to remove any elastic tension, which assists you in increasing your strength.