Can I install with a very tight grout line and not the recommended size of 1/8″ (3/16″ for 12″ modules)?
Possibly, however it depends on whether or not the natural irregularity in tile size and shape allows for a tighter fit (typically easier with smaller sizes). It also requires a much more skilled installation to get a good end result. If the grout line is too tight the tile could chip at stress points while the grout dries. Your tile installer should have a grout selection kit with the many shades of grout available and there will likely be a choice that blends in with the tile rather than creating contrast.
