I have almost the EXACT same setup you do, minus a fluorescent bulb, and I couldn't get the humidity over 30%. I put a moist (just mist the hell out of it 'til it's damp to the touch, not TOO wet) towel over 85% of the screen top and I haven't had a problem since. My humidity sits at about 55% for majority of the time and I only have to wet the towel every morning (since I have a space heater in my room it dries the towel out).
This should fix your problem and it costs nothing!
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