I don't think running out of developing agent can cause coarse grain.(posted 8993 days ago)And concerning your book: You should re-read some of it, because you may have missed some point. Whenever I have one 35 mm Ilford Delta to develop, I use 275 ml of Ilford HC at 1+31, i.e. 8,6 ml of the concentrate. This works fine. 550 ml at 1:3 (which, the way I understand it, is 1+2) should contain much more developing agent than can ever be consumed by a single film.