The herpstat will help you out when it comes. A thermostats job is to maintain consistent temps. Without one, you will always see the temp fluctuation. That being said, you shouldn't really need two UTHs and a CHE. At most you should need two heating devices.
What are the readings you are getting from your thermometers currently? Where are they placed in the tank? You will want to stick a probe right on the glass where the UTH is under the substrate. This is the hottest point the snake can get too so you want to monitor is. UTHs don't really heat the air, just the bottom of the tank so putting the probe above the substrate will make it seem like the UTH isn't doing its job at all, when it is probably running a little hotter then it should.
If your average room temp is lower then 75*F at any time, you can use an extra heating source. If you are having trouble with humidity, the lamp is only going to make it worse but you can use a very low wattage bulb or CHE. Another UTH won't do much for air temperatures. If your air temps are really low, you will need some kind of overhead heat.
You could also look into a radiant heat panel, but those are a little pricey.
Hope this helps!
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