What software are you planning on stitching the mosaic together with?
Microsoft Image composite editor will work with around 20% overlap for sure. When i have done lunar mosaics i have always visually checked that there is at least one prominent crater in adjacent panels, dont have a number but i think 20% is right around there and sounds good.
If you plan on producing a monochrome image, then use only one filter. Depends on seeing what the best solution is, because different wavelengths are affected differently due to seeing. Longer, redder, wavelengths are more resistant to seeing but have the potential to not uncover all detail due to diffraction while shorter, bluer, wavelengths have the potential to be sharper but are significantly more prone to losses to seeing. In most cases though we are not close to the diffraction limit (at least in my typical 1.5-2'' seeing). If i were you i would probably use just the red filter and do a video of the longest possible duration you can manage.
