Gusi, sorry to see your thread has gone off topic. I hope this does not deter you from using APUG as a resource. Since you are new here, I feel I should point out that this sort of thing does not normally happen here. As you can tell not everyone agrees on the best way to develop film, expose film, what makes a good print. So making a set of prints at different film speeds, different development times, and printing them at different paper grades can help you see the effects of changing each of these variables.