Check out Layne Norton's DUP style of training. I have been on a similar program and I have grown exponentially from it. My strength has gone up considerably as well. My percentages are based off of my 3 rep max on the big 4 lifts. I don't go to failure very often either. There has been good research suggesting that if you train to failure often, you are actually reducing your total volume moved versus leaving 1-2 reps in the tank (which allows more total volume moved)