Hi,
To be able to answer we really need more details about the enclosure you are using - pics would probably be easiest.
But one piece of advice on the bulb - don't mess around buying different wattages. Buy a good wattage that you know will be able to hold the temps if the UTH's can't cut it and then use something to control it - ideally a proportional thermostat but in a pinch a dimmer and you manually adjusting it.
If you can do it with UTH's then that's really the way most people would recommend.
What kind of thermometers are you using and where are you taking the readings?
What kind of insulation did you have in mind? This will probably depend on caging type but let us know what you can get access to easily.
dr del
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