To develop Tri-X, I use 10cc of Rodinal for every roll. If I am developing two rolls of film in a two-reel tank, I fill the tank with water at 68 degrees to within a quarter of an inch of the brim. Then I pour in in 20 cc of developer and stir. This is generally considered too harsh a solution, but it gives me the quality I desire. An eleven minute development time with agitation every minute and a half for ten seconds yields a contrasty negative having the appearance of blocked highlights. Thinner negatives, finer grain, longer development... I've tried all of these approaches, but the only negative that I consider interesting in terms of its potential is the overexposed, over developed one.