I keep my load range E tires at 80 PSI rear and 65 PSI front as recommended on the door jam sticker. I always check and fill first thing in the morning while they are cold. The manufacturer understands that a load range E tire will carry a load and that they will build pressure with heat. Follow the recommendations for you set up as noted on the sticker inside the drivers door jam and don't worry about it. I have no proof but I would guess many more tires fail by being under inflated than over inflated.
