Since the OP cited a “lot of research” supposedly validating chiropractic treatments, it might be of interest to note that there’s a new “study” claiming that chiropractic adjustments are good for treating autism - at least, if you can hold the kids down long enough.
“For the cervical group, these chiropractors were taking a plunger, sticking it between the mastoid process right near the ear and the back part of the mandible and hitting it to “impart energy,” all accompanied by unnecessary radiation exposure and trauma of being held down in order to obtain completely unnecessary X-rays of the cervical spine.”
The article describing this latest travesty provides a good example of what passes for research in the chiro world.