I don't own the lights, but I would suggest better leds, with a wider light angle, remember leds are really focused if yours have a narrow angle then there will uneven areas. Also maybe the rings that cover the bulbs aren't doing their job on diffusing the light. If I were you I would try to open them and install ccfl rings but you don't want to open them so, its all about the width of the beam and diffusing it efficiently, try some leds with more chips that fit, measure your spacing and the select the led that fits: http://autolumination.com/194.htm
I though about telling you to sand the clear cover on them if your leds have it cause that would diffused the light but that could make them even dimmer if your leds aren't that bright.
Thats all I can think of hope you can get them the way you want.
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