If it were me I would want more heat.
It looks like your using a lamp stand. If so, you can use the lamp fixture spring clamp and hook that to the lamp stand so the lamp could be adjusted to a different angle. This way you cold point the lamp more toward the center of the tank to deliver more heat to the cool side. Doing this may allow you to use a larger watt bulb since the hot spot created by the bulb will now be farther away making it cooler.
Another thing I think of is switching from the blue bulb to a red. I like the look of the blue night bulbs too but they don't deliver the same heat it seems as a red one.
I would also put cardboard on top of the plastic wrap to insulate the top which should trap some heat as well.
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