I have Crawley's articles from which you quote.I suggest that Crawley never stuck to his original definition of acutance as a scientifically measurable quantity.
For instance in BJP Jan 27 1961 p41 he says of FX-2...."If agitation is reduced to every other minute or third minute with an increase in time up to 1/3 or 1/2, negatives of interesting internal gradation and acutance may be obtained...".
The acutance he refers to here includes adjacency effects,as Dr Henry explained it is not a scientifically measurable quantity.