The one thing to also consider with regards to your HDR images is the conditions you are shooting in. Those conditions aren't suited for HDR images.
I'm paraphrashing what I learned from my photography class here:
In photography, dynamic range is measured in
EV differences (known as
stops) between the brightest and darkest parts of the image that show detail. The human eye can see a wider range (~10-14) stops compared to a digital camera (~9 stops). By braketing the exposure, and overlaying them, you are able to replicate with a digital camera what your eye can see. In an image that would look good with HRD, you would see blown out highlights (detail is blown out white) or super rich blacks (detail is lost in the black).
Image 1, 2, 3, & 8 This bright sunlight, lit from the site, nothing is blown out or nothing is true deep black. You can see detail everywhere. No need for HDR.
Image 4, 5, 6, 9 These images are all taken in very shaded soft light, which again is captured with the dynamic range of your camera. You can see detail in the shadows (tire tread, under the car, etc) and you can also see some detail in the highlights. The only spot where I could see you benefiting from HDR is in image 5. The sky (and the reflected sky on the hood of the car) are blown out. If there were clouds in the sky, you could have benefited from HDR. But if it was a featureless sky (just blank, blue), wouldn't have helped.
With these images, even going through the HDR processing, you are just basically creating the same thing that you would have taken from a correctly exposed photograph.
To truly utilize HDR, you need to capture an image that is going to have areas that are blown out in the highlights or lacking detail in the shadows.