I know the basking spot needs to be 95-110° but I feel like I have yet to achieve that temp. Right now I have 3 lamps on him: 1 UVB and 2 150watt basking bulbs, plus 2 heating mats on the sides of the tank. Thermo reads 81°. Do I need 4 lamps? Is there higher wattage for basking bulbs? Do I need in-tank non-lamp heat sources? Is my thermometer unreliable? Hoping to find some help so our little guy can thrive & be happy.