So I got my new thermostat today and couldn't be more excited. It's the BAH 1000DC model from Big Apple Herp. Well it's all plugged in and set to what I want, but this is where my question comes into play.

After having it set for a couple hours, the surface temp is hovering at about 81-83 (hot side). The probe was placed on the glass above the UTH, and the temp on the thermostat was set to 93. My question is this: How do you get the UTH to appropriately heat through the substrate and get to the desired temperatures? I currently use aspen bedding, which is about 2" deep.

Extra Credit:
I recently bought a 40 gal breeder tank from the petco $1/gal sale. I haven't moved from my 20L yet, since I was waiting until I move next month. I have already bought the larger UTH and all, but was wondering if anyone out there who uses the 40 gal tank would be able to tell me what wattage bulb you use to maintain the cool side and ambient temps.

Thanks all!!!