I don't do what I do to affect grain one way or another. I really don't give a rip about grain. It is ALL about tonality. Rich fat blacks that are heavy, and lots of tone where it matters. Most people I know get so hung up on grain and miss so much potential of the film.
Experiment with your film until you have something you like. Overexpose, underexpose, overdevelop, underdevelop, etc. Just try many different things until you find what you like.
The filters you mention can be useful, but not for every damned shot, because they seriously mess with how the film sees color.
I also don't understand why people are so hung up on shooting everything wide open. Does it really make the pictures better, or is it just another gimmick to cover up something inadequate? Depth of field is a tool to control how much is in focus, based on how close to the subject you are, what lens you use, and how much of what's in the frame is important to show. Again, experiment, and don't lock yourself into a corner where you only see a small portion of what's possible.
Sent from my iPhone using Tapatalk 2