This is what I would do if I had the materials that you have.
I'm not sure what that substrate is, but personally, I would switch it out for newspaper or paper towel (that's all I really have experience using) and put the larger heat pad underneath of the tank. Situating the probe in between the heat pad and the glass, having both on the outside of the tank. Set the temp on your thermostat to 90, and then use your temp gun and measure the floor of the cage right above the heat pad. Make adjustments to the thermostat until your temp gun is reading between 88 and 92.
I would move the lamp to the middle of the enclosure, and cover the majority of the screen top with aluminum foil. Buy a digital thermometer and put it on one end of the cage, and put the probe for it on the other. If your temperature is too high because of the light, you may need to buy a dimmer switch and adjust it until you get the proper ambient temp of 80 to 83.
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