Dr. Richard Henry, in "Controls in Black and White Photography," states that his tests show adjacency effects are caused by "lateral diffusion in the emulsion layer" and are not dependent on agitation. There are plenty of other people who swear that reducing agitation increases edge effects, but none that I know of who have conducted verifiable tests like Dr. Henry.(posted 8391 days ago)You may wish to try greater dilutions to increase edge effects--such as 1:75 or 1:100--but you will probably lose film speed.