I have been shooting ilford film for the last 2 years now, and having shot at least 2000 photos I have realized that most of the ones I like in terms of tonality and depth where shot on ilfords pan F +. I have tried delta 100 and 400 but for some reason the grays look flatter. Does ilford make a higher speed version of Pan F + ? Like a 400iso version for example ? I would like to get a faster film (for the times 50iso is to slow) with the same tonal characteristics of Pan F +. I develop in Ilford DDX and i'm wondering if maybe this developer causes other films to have a flatter grayscale but leaves pan F+ alone. Does the use of distilled water cause problems with modern films ? I have not really tried the HP series of films enough, how are they compared to delta 100 or 400 ? Am I maybe using the wrong developer (ddx) on the modern films that causes grayscale this flatness ? Any recommendations here ? Any tips would be great. Thank you in advance.