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Don't know man... I keep the ISO/ASA at 200, as the film is for that, as far as I know. If you've got some recommendations, by all means... I'm still learning ;)

What film are you using then? I don't have any tips in mind, but I've been told to meter films with iso400 (like Superia Xtra for example) at 100-200 because they have tendency for overexposure. As for push processing - by setting film that has, for example, box speed at iso 200 to iso 400, you get film with stronger contrast and grain. Some photo studios refuse to develop pushed/pulled film though, because that would require them to keep film in development for shorter or longer period and that might be tricky.