You didn't say what kind of thermometers you are using. It is entirely possible that the temps are far colder or far warmer than what you think they are simply because your thermometer is inaccurate.
While the mid 70's isn't terrible for the ambient temperature, it is far too cold if you don't have a hot spot in the low 90's. My advice would be to get some good digital thermometers with probes.
If your humidity is fine with the lamps, you might as well stay with the lamps. You don't need a ceramic bulb, but I think a higher wattage bulb might be on the menu.
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