Tire psi

As most (if not all) of you know, psi increases as tires warm up due to driving. My experience, here in Fl. where air and road temperatures get ungodly hot, is that it is not unusual for tires to gain 10 or more psi within just a few miles of driving. That increase in pressure begins to make ride and handling less pleasant! Question: if I should be running 90 psi, is there any reason why I cannot start with a cold psi pressure of 5 pounds less than 90 knowing that within about 5 miles I'll be right back up to or beyond the required 90 psi? Thanks / Larry