Don't "'slot' adjust each individual string." It's going to be a mess.
Is the current saddle has sufficient height to take off 1/16th (about 1.5mm I guess)?
Taking off 1/16th at the saddle will drop the strings about 1/32th (not exact, because it depends on the height of the strings at the nut) at the 12th fret.
I would buy an "empty" saddle (e.g
https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1) for the experiment, leaving the current saddle alone just in case you need to come back to it. Using the current saddle as a template, with sandpaper on a flat surface, take off material from the bottom of the new saddle until you feel comfortable.