Alex, I've been reading a lot of your insight on photos and am curious to see what you think.
Blue is actually a good color for absorbing light, where a lighter/shinier color could cause light reflections that create some unwanted hotspots. It looks like you have a lot of direct light pointed directly at the cars. Look into some ways to diffuse the light - that should tone some of the harshness down. A few setting changes in the camera will help as well.
Overall, you're at a good point to experiment. Through some toying around, I think you will find a decent way to even the light out.
Once you get the light evenly distributed, and better diffused here are some next steps:
1. Play with the ISO - the higher the ISO number in your camera the more sensitive it is to light.
2. Then play around with some differing shutter speeds.
You will probably find that different shutter speed + ISO combinations work for different sized and colored vehicles.
You're definitely on the right track :thumbup:
For some extra reading, this is good start on lighting:
Studio Photography guide and tips from Photo.net
How to diffuse light:
How to Diffuse Light - wikiHow
If you need some extra diffusing equipment, check this out:
Filters, Diffusers & Gels