Actually, diy emulsion grain can be almost invisible. Unfortunately, the conflicting issue is then slow speed. I don't think it'll ever be easy to make artisan film that has both the speed and fine grain of the most modern commercial films, but I also don't think that will be seen as problem by folks wanting to roll their own.

hrst: you can almost eliminate the wrinkles in subbed acetate by sandwiching the film between two sheets of 1-ply mat board (or similar) and applying a warm clothes iron, followed immediately by cooling under a weighted surface. It takes just a bit of experimentation to get the right temperature, but it does work. Having said that, I look forward to the next round of your corona discharge experiments!