[You may be describing another branch of service, but Marine CAS always came in very hot, accurate, and did not miss.]
When they do perform "CAS" (except for their Warthogs) it's from 8,000 ft AGL and God help you if it's Danger Close.
We were bombed by an F-100 in August 1966 who ignored our air panels, colored smoke, and frantic radio calls and bombed the company ahead of us. 22 dead.